diff --git a/Kieker.WebGUI/lib/JointJS.LICENSE b/Kieker.WebGUI/lib/JointJS.LICENSE
deleted file mode 100644
index 6505664029f71857c473b8c8b716e3a71a206265..0000000000000000000000000000000000000000
--- a/Kieker.WebGUI/lib/JointJS.LICENSE
+++ /dev/null
@@ -1,9 +0,0 @@
-MIT license
-
-Copyright (c) 2009 David Durman
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/Kieker.WebGUI/lib/RaphaelJS.LICENSE b/Kieker.WebGUI/lib/RaphaelJS.LICENSE
deleted file mode 100644
index 1b09f72dd011dde3f7e903a24a9565965b616c5a..0000000000000000000000000000000000000000
--- a/Kieker.WebGUI/lib/RaphaelJS.LICENSE
+++ /dev/null
@@ -1,9 +0,0 @@
-MIT license
-
-Copyright © 2008 Dmitry Baranovskiy
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-The software is provided “as is”, without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
\ No newline at end of file
diff --git a/Kieker.WebGUI/lib/js-graph-it.LICENSE b/Kieker.WebGUI/lib/js-graph-it.LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..02bbb60bc49afc2d6a1bedf96288eab236d80fbd
--- /dev/null
+++ b/Kieker.WebGUI/lib/js-graph-it.LICENSE
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
\ No newline at end of file
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/beans/request/StringToIDBean.java b/Kieker.WebGUI/src/main/java/kieker/webgui/beans/request/StringToIDBean.java
new file mode 100644
index 0000000000000000000000000000000000000000..33d45b238bc796c517645334c9812c6f5a51f598
--- /dev/null
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/beans/request/StringToIDBean.java
@@ -0,0 +1,17 @@
+package kieker.webgui.beans.request;
+
+import javax.faces.bean.ManagedBean;
+import javax.faces.bean.RequestScoped;
+
+/**
+ *
+ * @author Nils Christian Ehmke
+ */
+@ManagedBean
+@RequestScoped
+public class StringToIDBean {
+
+    public String stringToID(final String string) {
+        return string.replace(" ", "");
+    }
+}
diff --git a/Kieker.WebGUI/src/main/webapp/main.xhtml b/Kieker.WebGUI/src/main/webapp/main.xhtml
index 435dd8e8181ff370ae938c0fc8750872f9e9d13f..5faf829dcf5b11019b6f8a3d1367cd7af8893642 100644
--- a/Kieker.WebGUI/src/main/webapp/main.xhtml
+++ b/Kieker.WebGUI/src/main/webapp/main.xhtml
@@ -11,9 +11,19 @@
         <h:head>
             <title>Kieker.WebGUI</title>
             <link rel="stylesheet" type="text/css" href="../main.css" />
+            <script type="text/javascript" src="../main/js-graph-it.js"/> 
+            <link rel="stylesheet" type="text/css" href="../main/js-graph-it.css"/>
+            <style>
+                .block { 
+                    position: absolute;
+                }
+                .connector {
+                    background-color: #FF9900;
+                }
+            </style>
         </h:head>
 
-        <h:body>
+        <h:body onload="initPageObjects();">
             <!-- This is the layout for the whole page. -->
             <p:layout id="layout" fullPage="true">
 
@@ -106,19 +116,29 @@
                 <!-- The following layout unit is within the center and used for the graph. -->
                 <p:layoutUnit position="center" id="centerLayout">
                     <h:form id="centerForm">
-                        <ui:repeat id="centerRepeat" value="#{selectedMainProjectBean.mainProject.plugins}" var="plugin">
-                            <p:panel header="#{plugin.name}" closable="true" closeSpeed="200" toggleSpeed="200" toggleable="true" id="plugin" style="width: 30%">
-                                <p:commandLink ajax="true" value="Configure" action="#{selectedPluginBean.setPlugin(plugin)}" update=":propertiesForm"/>
-                                <br/>
-                                <p:commandLink ajax="true" value="Connect" update=":connectionDialogForm" onclick="connectionDialog.show();"/>
-                                <br/>
-                                <p:commandLink ajax="true" value="Rename" action="#{selectedPluginBean.setPlugin(plugin)}"  update=":propertiesForm" onclick="pluginRenamingDialog.show();"/>
-                                <p:ajax event="close" listener="#{selectedMainProjectBean.removePlugin(plugin)}"  update=":centerForm :propertiesForm" /> 
-                            </p:panel>
-                            <p:draggable for="plugin">
-                            </p:draggable>
-
-                        </ui:repeat>
+                        <div class="canvas" id="mainCanvas" style="width: auto; height: 500px">
+                            <c:forEach items="#{selectedMainProjectBean.mainProject.plugins}" var="plugin">
+                              <div class="block draggable" style="border-width: 1px; border-style: solid; border-color: gray" id="#{stringToIDBean.stringToID(plugin)}">
+                                    <h:outputText style="font-weight: bold" value="#{plugin.getName()}"/>
+                                    <hr/>
+                                    <p:commandLink ajax="true" value="Configure" action="#{selectedPluginBean.setPlugin(plugin)}" update=":propertiesForm"/>
+                                    <br/>
+                                    <p:commandLink ajax="true" value="Connect" update=":connectionDialogForm" onclick="connectionDialog.show();"/>
+                                    <br/>
+                                    <p:commandLink ajax="true" value="Rename" action="#{selectedPluginBean.setPlugin(plugin)}"  update=":propertiesForm" onclick="pluginRenamingDialog.show();"/>
+                                    <br/>
+                                    <p:commandLink ajax="true" value="Remove" action="#{selectedMainProjectBean.removePlugin(plugin)}"  update=":propertiesForm"/>
+                                </div>
+                            </c:forEach>
+                            <c:forEach items="#{selectedMainProjectBean.connections}" var="connection">
+                                <div class="connector #{stringToIDBean.stringToID(connection.source)} #{stringToIDBean.stringToID(connection.destination)}">
+                                    <label class="source-label"><h:outputText value="#{connection.outputPort.getName()}"/></label>
+                                    <label class="destination-label"><h:outputText value="#{connection.inputPort.getName()}"/></label>
+
+                                    <img src="../main/arrow.gif" class="connector-end"/>
+                                </div>
+                            </c:forEach>
+                        </div>
                     </h:form>
                 </p:layoutUnit>
                 <!-- ******************************************************************************** -->
diff --git a/Kieker.WebGUI/src/main/webapp/main/arrow.gif b/Kieker.WebGUI/src/main/webapp/main/arrow.gif
new file mode 100644
index 0000000000000000000000000000000000000000..e59288f31e1ff06c5e496099161024e94df6027c
Binary files /dev/null and b/Kieker.WebGUI/src/main/webapp/main/arrow.gif differ
diff --git a/Kieker.WebGUI/src/main/webapp/main/arrow_d.gif b/Kieker.WebGUI/src/main/webapp/main/arrow_d.gif
new file mode 100644
index 0000000000000000000000000000000000000000..6dd0addefafcf9b0330ce5a71e7db0edc23b6a60
Binary files /dev/null and b/Kieker.WebGUI/src/main/webapp/main/arrow_d.gif differ
diff --git a/Kieker.WebGUI/src/main/webapp/main/arrow_l.gif b/Kieker.WebGUI/src/main/webapp/main/arrow_l.gif
new file mode 100644
index 0000000000000000000000000000000000000000..0f7c1e3d931f90eebe48503b5c99df2e2bfbd304
Binary files /dev/null and b/Kieker.WebGUI/src/main/webapp/main/arrow_l.gif differ
diff --git a/Kieker.WebGUI/src/main/webapp/main/arrow_r.gif b/Kieker.WebGUI/src/main/webapp/main/arrow_r.gif
new file mode 100644
index 0000000000000000000000000000000000000000..e59288f31e1ff06c5e496099161024e94df6027c
Binary files /dev/null and b/Kieker.WebGUI/src/main/webapp/main/arrow_r.gif differ
diff --git a/Kieker.WebGUI/src/main/webapp/main/arrow_u.gif b/Kieker.WebGUI/src/main/webapp/main/arrow_u.gif
new file mode 100644
index 0000000000000000000000000000000000000000..2d3dfdcccd98e099fbc08a1d3843709491363ca1
Binary files /dev/null and b/Kieker.WebGUI/src/main/webapp/main/arrow_u.gif differ
diff --git a/Kieker.WebGUI/src/main/webapp/main/js-graph-it.css b/Kieker.WebGUI/src/main/webapp/main/js-graph-it.css
new file mode 100644
index 0000000000000000000000000000000000000000..46757760948b2ec7f94dfb6755557f1be088352c
--- /dev/null
+++ b/Kieker.WebGUI/src/main/webapp/main/js-graph-it.css
@@ -0,0 +1,24 @@
+.draggable
+{
+	position: absolute;
+	cursor: move;
+	z-index: 1;
+}
+
+.connector
+{
+	background-color: black;
+}
+
+.dock_point
+{
+	height: 1px;
+	width: 1px;
+	overflow: hidden;
+	padding: 0px !important;
+	border: none !important;
+	margin: 0px !important;
+	position: absolute;
+	font-size: 1px;
+	visibility: hidden;
+}
\ No newline at end of file
diff --git a/Kieker.WebGUI/src/main/webapp/main/js-graph-it.js b/Kieker.WebGUI/src/main/webapp/main/js-graph-it.js
new file mode 100644
index 0000000000000000000000000000000000000000..9482cc8d7ce5ad129ea4bb270377e04c70fae40c
--- /dev/null
+++ b/Kieker.WebGUI/src/main/webapp/main/js-graph-it.js
@@ -0,0 +1,1801 @@
+/*********************
+ * browser detection *
+ *********************/
+
+var ie=document.all;
+var nn6=document.getElementById&&!document.all;
+
+/****************************************************
+ * This class is a scanner for the visitor pattern. *
+ ****************************************************/
+ 
+/**
+ * Constructor, parameters are:
+ * visitor: the visitor implementation, it must be a class with a visit(element) method.
+ * scanElementsOnly: a flag telling whether to scan html elements only or all html nodes.
+ */
+function DocumentScanner(visitor, scanElementsOnly)
+{
+	this.visitor = visitor;
+	this.scanElementsOnly = scanElementsOnly;
+
+	/**
+	 * Scans the element
+	 */
+	this.scan = function(element)
+	{
+		var i;
+		if(this.visitor.visit(element))
+		{
+			// visit child elements
+			var children = element.childNodes;
+			for(i = 0; i < children.length; i++)
+			{
+				if(!this.scanElementsOnly || children[i].nodeType == 1)
+				{
+					this.scan(children[i]);
+				}
+			}
+		}		
+	}	
+}
+
+/*****************
+ * drag and drop *
+ *****************/
+ 
+var isdrag=false;					// this flag indicates that the mouse movement is actually a drag.
+var mouseStartX, mouseStartY;		// mouse position when drag starts
+var elementStartX, elementStartY;	// element position when drag starts
+
+/**
+ * the html element being dragged.
+ */
+var elementToMove;
+
+/**
+ * an array containing the blocks being dragged. This is used to notify them of move.
+ */
+var blocksToMove;
+
+/**
+ * this variable stores the orginal z-index of the object being dragged in order
+ * to restore it upon drop.
+ */ 
+var originalZIndex;
+
+/**
+ * an array containing bounds to be respected while dragging elements,
+ * these bounds are left, top, left + width, top + height of the parent element.
+ */
+var bounds = new Array(4);
+
+/**
+ * this visitor is used to find blocks nested in the element being moved.
+ */
+function BlocksToMoveVisitor()
+{
+	this.visit = function(element)
+	{
+		if(isBlock(element))
+		{
+			blocksToMove.push(findBlock(element.id));
+			return false;
+		}
+		else
+			return true;
+	}
+}
+
+var blocksToMoveScanner = new DocumentScanner(new BlocksToMoveVisitor(), true);
+
+function movemouse(e)
+{
+	if (isdrag)
+	{
+		var currentMouseX = nn6 ? e.clientX : event.clientX;
+		var currentMouseY = nn6 ? e.clientY : event.clientY;
+		var newElementX = elementStartX + currentMouseX - mouseStartX;
+		var newElementY = elementStartY + currentMouseY - mouseStartY;
+
+		// check bounds
+		// note: the "-1" and "+1" is to avoid borders overlap
+		if(newElementX < bounds[0])
+			newElementX = bounds[0] + 1;
+		if(newElementX + elementToMove.offsetWidth > bounds[2])
+			newElementX = bounds[2] - elementToMove.offsetWidth - 1;
+		if(newElementY < bounds[1])
+			newElementY = bounds[1] + 1;
+		if(newElementY + elementToMove.offsetHeight > bounds[3])
+			newElementY = bounds[3] - elementToMove.offsetHeight - 1;
+		
+		// move element
+		elementToMove.style.left = newElementX + 'px';
+		elementToMove.style.top  = newElementY + 'px';
+
+//		elementToMove.style.left = newElementX / elementToMove.parentNode.offsetWidth * 100 + '%';
+//		elementToMove.style.top  = newElementY / elementToMove.parentNode.offsetHeight * 100 + '%';
+	
+		elementToMove.style.right = null;
+		elementToMove.style.bottom = null;
+		
+		var i;
+		for(i = 0; i < blocksToMove.length; i++)
+		{
+			blocksToMove[i].onMove();
+		}
+		return false;
+	}
+}
+
+/**
+ * finds the innermost draggable element starting from the one that generated the event "e"
+ * (i.e.: the html element under mouse pointer), then setup the document's onmousemove function to
+ * move the element around.
+ */
+function startDrag(e) 
+{	
+	var eventSource = nn6 ? e.target : event.srcElement;
+	if(eventSource.tagName == 'HTML')
+		return;
+
+	while (eventSource != document.body && !hasClass(eventSource, "draggable"))
+	{  	
+		eventSource = nn6 ? eventSource.parentNode : eventSource.parentElement;
+	}
+
+	// if a draggable element was found, calculate its actual position
+	if (hasClass(eventSource, "draggable"))
+	{
+		isdrag = true;
+		elementToMove = eventSource;
+
+		// set absolute positioning on the element		
+		elementToMove.style.position = "absolute";
+				
+		// calculate start point
+		elementStartX = elementToMove.offsetLeft;
+		elementStartY = elementToMove.offsetTop;
+		
+		// calculate mouse start point
+		mouseStartX = nn6 ? e.clientX : event.clientX;
+		mouseStartY = nn6 ? e.clientY : event.clientY;
+		
+		// calculate bounds as left, top, width, height of the parent element
+		if(getStyle(elementToMove.parentNode, "position") == 'absolute')
+		{
+			bounds[0] = 0;
+			bounds[1] = 0;
+		}
+		else
+		{
+			bounds[0] = calculateOffsetLeft(elementToMove.parentNode);
+			bounds[1] = calculateOffsetTop(elementToMove.parentNode);
+		}
+		bounds[2] = bounds[0] + elementToMove.parentNode.offsetWidth;
+		bounds[3] = bounds[1] + elementToMove.parentNode.offsetHeight;		
+		
+		// either find the block related to the dragging element to call its onMove method
+		blocksToMove = new Array();
+		
+		blocksToMoveScanner.scan(eventSource);
+		document.onmousemove = movemouse;
+		
+		originalZIndex = getStyle(elementToMove, "z-index");
+		elementToMove.style.zIndex = "3";
+		
+		return false;
+	}
+}
+
+function stopDrag(e)
+{
+	isdrag=false; 
+	if(elementToMove)
+		elementToMove.style.zIndex=originalZIndex;
+	elementToMove = null;
+	document.onmousemove = null;
+}
+
+document.onmousedown = startDrag;
+document.onmouseup = stopDrag;
+
+
+
+/*************
+ * Constants *
+ *************/
+var LEFT = 1;
+var RIGHT = 2;
+var UP = 4;
+var DOWN = 8;
+var HORIZONTAL = LEFT + RIGHT;
+var VERTICAL = UP + DOWN;
+var AUTO = HORIZONTAL + VERTICAL;
+
+var START = 0;
+var END = 1;
+var SCROLLBARS_WIDTH = 18;
+
+/**************
+ * Inspectors *
+ **************/
+
+var inspectors = new Array();
+
+/**
+ * The canvas class.
+ * This class is built on a div html element.
+ */
+function Canvas(htmlElement)
+{
+	/*
+	 * initialization
+	 */
+	this.id = htmlElement.id;
+	this.htmlElement = htmlElement;
+	this.blocks = new Array();
+	this.connectors = new Array();
+	this.offsetLeft = calculateOffsetLeft(this.htmlElement);
+	this.offsetTop = calculateOffsetTop(this.htmlElement);	
+	
+	this.width;
+	this.height;
+
+	// create the inner div element
+	this.innerDiv = document.createElement("div");
+	
+	this.initCanvas = function()
+	{
+		// setup the inner div
+		var children = this.htmlElement.childNodes;
+		var i;
+		var el;
+		var n = children.length;
+		for(i = 0; i < n; i++)
+		{
+			el = children[0];
+			this.htmlElement.removeChild(el);
+			this.innerDiv.appendChild(el);
+			if(el.style)
+				el.style.zIndex = "2";
+		}
+		this.htmlElement.appendChild(this.innerDiv);
+
+		this.htmlElement.style.overflow = "auto";
+		this.htmlElement.style.position = "relative";
+		this.innerDiv.id = this.id + "_innerDiv";
+		this.innerDiv.style.border = "none";
+		this.innerDiv.style.padding = "0px";
+		this.innerDiv.style.margin = "0px";
+		this.innerDiv.style.position = "absolute";
+		this.innerDiv.style.top = "0px";
+		this.innerDiv.style.left = "0px";
+		this.width = 0;
+		this.height = 0;
+		this.offsetLeft = calculateOffsetLeft(this.innerDiv);
+		this.offsetTop = calculateOffsetTop(this.innerDiv);
+
+		// inspect canvas children to identify first level blocks
+		new DocumentScanner(this, true).scan(this.htmlElement);
+		
+		// now this.width and this.height are populated with minimum values needed for the inner
+		// blocks to fit, add 2 to avoid border overlap;
+		this.height += 2;
+		this.width += 2;
+		
+		var visibleWidth = this.htmlElement.offsetWidth - 2; // - 2 is to avoid border overlap
+		var visibleHeight = this.htmlElement.offsetHeight - 2; // - 2 is to avoid border overlap
+		
+		// consider the scrollbars width calculating the inner div size
+		if(this.height > visibleHeight)
+			visibleWidth -= SCROLLBARS_WIDTH;
+		if(this.width > visibleWidth)
+			visibleHeight -= SCROLLBARS_WIDTH;
+			
+		this.height = Math.max(this.height, visibleHeight);
+		this.width = Math.max(this.width, visibleWidth);
+		
+		this.innerDiv.style.width = this.width + "px";
+		this.innerDiv.style.height = this.height + "px";
+		
+		// init connectors
+		for(i = 0; i < this.connectors.length; i++)
+		{
+			this.connectors[i].initConnector();
+		}
+	}
+	
+	this.visit = function(element)
+	{
+		if(element == this.htmlElement)
+			return true;
+	
+		// check the element dimensions against the acutal size of the canvas
+		this.width = Math.max(this.width, calculateOffsetLeft(element) - this.offsetLeft + element.offsetWidth);
+		this.height = Math.max(this.height, calculateOffsetTop(element) - this.offsetTop + element.offsetHeight);
+		
+		if(isBlock(element))
+		{
+			// block found initialize it
+			var newBlock = new Block(element, this);
+			newBlock.initBlock();
+			this.blocks.push(newBlock);
+			return false;
+		}
+		else if(isConnector(element))
+		{
+			// connector found, just create it, source or destination blocks may not 
+			// have been initialized yet
+			var newConnector = new Connector(element, this);
+			this.connectors.push(newConnector);
+			return false;
+		}
+		else
+		{
+			// continue searching nested elements
+			return true;
+		}
+	}
+	
+	/*
+	 * methods
+	 */	
+	this.print = function()
+	{
+		var output = '<ul><legend>canvas: ' + this.id + '</legend>';
+		var i;
+		for(i = 0; i < this.blocks.length; i++)
+		{
+			output += '<li>';
+			output += this.blocks[i].print();
+			output += '</li>';
+		}
+		output += '</ul>';
+		return output;
+	}
+	
+	/*
+	 * This function searches for a nested block with a given id
+	 */
+	this.findBlock = function(blockId)
+	{
+		var result;
+		var i;
+		for(i = 0; i < this.blocks.length && !result; i++)
+		{
+			result = this.blocks[i].findBlock(blockId);
+		}
+		
+		return result;
+	}
+	
+	this.toString = function()
+	{
+		return 'canvas: ' + this.id;		
+	}
+}
+
+/*
+ * Block class
+ */
+function Block(htmlElement, canvas)
+{	
+	/*
+	 * initialization
+	 */
+	 
+	this.canvas = canvas;
+	this.htmlElement = htmlElement;
+	this.id = htmlElement.id;
+	this.blocks = new Array();
+	this.moveListeners = new Array();
+	
+	if(this.id == 'description2_out1')
+		var merda = 0;
+	this.currentTop = calculateOffsetTop(this.htmlElement) - this.canvas.offsetTop;
+	this.currentLeft = calculateOffsetLeft(this.htmlElement) - this.canvas.offsetLeft;
+	
+	this.visit = function(element)
+	{
+		if(element == this.htmlElement)
+		{
+			// exclude itself
+			return true;
+		}
+
+		if(isBlock(element))
+		{
+			var innerBlock = new Block(element, this.canvas);
+			innerBlock.initBlock();
+			this.blocks.push(innerBlock);
+			this.moveListeners.push(innerBlock);
+			return false;
+		}
+		else
+			return true;
+	}
+	
+	this.initBlock = function()
+	{
+		// inspect block children to identify nested blocks
+		
+		new DocumentScanner(this, true).scan(this.htmlElement);
+	}
+	
+	this.top = function()
+	{
+		return this.currentTop;
+	}
+	
+	this.left = function()
+	{
+		return this.currentLeft;
+	}
+	
+	this.width = function()
+	{
+		return this.htmlElement.offsetWidth;		
+	}
+	
+	this.height = function()
+	{
+		return this.htmlElement.offsetHeight;
+	}
+	
+	/*
+	 * methods
+	 */	
+	this.print = function()
+	{
+		var output = 'block: ' + this.id;
+		if(this.blocks.length > 0)
+		{
+			output += '<ul>';
+			var i;
+			for(i = 0; i < this.blocks.length; i++)
+			{
+				output += '<li>';
+				output += this.blocks[i].print();
+				output += '</li>';
+			}
+			output += '</ul>';
+		}
+		return output;
+	}
+	
+	/*
+	 * This function searches for a nested block (or the block itself) with a given id
+	 */
+	this.findBlock = function(blockId)
+	{
+		if(this.id == blockId)
+			return this;
+			
+		var result;
+		var i;
+		for(i = 0; i < this.blocks.length && !result; i++)
+		{
+			result = this.blocks[i].findBlock(blockId);
+		}
+		
+		return result;
+	}
+	
+	this.move = function(left, top)
+	{
+		this.htmlElement.style.left = left;
+		this.htmlElement.style.top = top;
+		
+		this.onMove();
+	}
+		
+	this.onMove = function()
+	{
+		var i;
+		this.currentLeft = calculateOffsetLeft(this.htmlElement) - this.canvas.offsetLeft;
+		this.currentTop = calculateOffsetTop(this.htmlElement) - this.canvas.offsetTop;
+		// notify listeners
+		for(i = 0; i < this.moveListeners.length; i++)
+		{
+			this.moveListeners[i].onMove();
+		}
+	}
+	
+	this.toString = function()
+	{
+		return 'block: ' + this.id;
+	}
+}
+
+/**
+ * This class represents a connector segment, it is drawn via a div element.
+ * A segment has a starting point defined by the properties startX and startY, a length,
+ * a thickness and an orientation.
+ * Allowed values for the orientation property are defined by the constants UP, LEFT, DOWN and RIGHT.
+ */
+function Segment(id, parentElement)
+{
+	this.id = id;
+	this.htmlElement = document.createElement('div');
+	this.htmlElement.id = id;
+	this.htmlElement.style.position = 'absolute';
+	this.htmlElement.style.overflow = 'hidden';
+	parentElement.appendChild(this.htmlElement);
+
+	this.startX;
+	this.startY;
+	this.length;
+	this.thickness;
+	this.orientation;
+	this.nextSegment;
+	this.visible = true;
+	
+	/**
+	 * draw the segment. This operation is cascaded to next segment if any.
+	 */
+	this.draw = function()
+	{
+		// set properties to next segment
+		if(this.nextSegment)
+		{
+			this.nextSegment.startX = this.getEndX();
+			this.nextSegment.startY = this.getEndY();			
+		}
+		
+		if(this.visible)
+			this.htmlElement.style.display = 'block';
+		else
+			this.htmlElement.style.display = 'none';
+	
+		switch(this.orientation)
+		{
+			case LEFT:
+				this.htmlElement.style.left = (this.startX - this.length) + "px";				
+				this.htmlElement.style.top = this.startY + "px";
+				this.htmlElement.style.width = this.length + "px";
+				this.htmlElement.style.height = this.thickness + "px";
+				break;
+			case RIGHT:
+				this.htmlElement.style.left = this.startX + "px";
+				this.htmlElement.style.top = this.startY + "px";
+				if(this.nextSegment)
+					this.htmlElement.style.width = this.length + this.thickness + "px";
+				else
+					this.htmlElement.style.width = this.length + "px";
+				this.htmlElement.style.height = this.thickness + "px";
+				break;
+			case UP:
+				this.htmlElement.style.left = this.startX + "px";
+				this.htmlElement.style.top = (this.startY - this.length) + "px";
+				this.htmlElement.style.width = this.thickness + "px";
+				this.htmlElement.style.height = this.length + "px";
+				break;
+			case DOWN:
+				this.htmlElement.style.left = this.startX + "px";
+				this.htmlElement.style.top = this.startY + "px";
+				this.htmlElement.style.width = this.thickness + "px";
+				if(this.nextSegment)
+					this.htmlElement.style.height = this.length + this.thickness + "px";
+				else
+					this.htmlElement.style.height = this.length + "px";
+				break;
+		}
+		
+		if(this.nextSegment)
+			this.nextSegment.draw();
+	}
+	
+	/**
+	 * Returns the "left" coordinate of the end point of this segment
+	 */
+	this.getEndX = function()
+	{		
+		switch(this.orientation)
+		{
+			case LEFT: return this.startX - this.length;
+			case RIGHT: return this.startX + this.length;
+			case DOWN: return this.startX;
+			case UP: return this.startX;
+		}
+	}
+	
+	/**
+	 * Returns the "top" coordinate of the end point of this segment
+	 */
+	this.getEndY = function()
+	{		
+		switch(this.orientation)
+		{
+			case LEFT: return this.startY;
+			case RIGHT: return this.startY;
+			case DOWN: return this.startY + this.length;
+			case UP: return this.startY - this.length;
+		}
+	}
+		
+	/**
+	 * Append another segment to the end point of this.
+	 * If another segment is already appended to this, cascades the operation so
+	 * the given next segment will be appended to the tail of the segments chain.
+	 */
+	this.append = function(nextSegment)
+	{
+		if(!nextSegment)
+			return;
+		if(!this.nextSegment)
+		{
+			this.nextSegment = nextSegment;
+			this.nextSegment.startX = this.getEndX();
+			this.nextSegment.startY = this.getEndY();
+		}
+		else
+			this.nextSegment.append(nextSegment);
+	}
+	
+	this.detach = function()
+	{
+		var s = this.nextSegment;
+		this.nextSegment = null;
+		return s;
+	}
+	
+	/**
+	 * hides this segment and all the following
+	 */
+	this.cascadeHide = function()
+	{
+		this.visible = false;
+		if(this.nextSegment)
+			this.nextSegment.cascadeHide();
+	}
+}
+/**
+ * Connector class.
+ * The init function takes two Block objects as arguments representing 
+ * the source and destination of the connector
+ */
+function Connector(htmlElement, canvas)
+{
+	/**
+	 * declaring html element
+	 */
+	this.htmlElement = htmlElement;
+	
+	/**
+	 * the canvas this connector is in
+	 */
+	this.canvas = canvas;
+	
+	/**
+	 * the source block
+	 */
+	this.source = null;
+	
+	/**
+	 * the destination block
+	 */
+	this.destination = null;	
+	
+	/**
+	 * preferred orientation
+	 */
+	this.preferredSourceOrientation = AUTO;
+	this.preferredDestinationOrientation = AUTO;
+	
+	/**
+	 * css class to be applied to the connector's segments
+	 */
+	this.connectorClass;
+	
+	/**
+	 * minimum length for a connector segment.
+	 */
+	this.minSegmentLength = 10;
+
+	/**
+	 * size of the connector, i.e.: thickness of the segments.
+	 */
+	this.size = 1;
+	
+	/**
+	 * connector's color
+	 */
+	this.color = 'black';
+	
+	/**
+	 * move listeners, they are notify when connector moves
+	 */
+	this.moveListeners = new Array();
+	
+	this.firstSegment;
+	
+	this.segmentsPool;
+	
+	this.segmentsNumber = 0;
+	
+	this.strategy;
+		
+	this.initConnector = function()
+	{
+		// detect the connector id
+		if(this.htmlElement.id)
+			this.id = this.htmlElement.id;
+		else
+			this.id = this.htmlElement.className;
+			
+		// split the class name to get the ids of the source and destination blocks
+		var splitted = htmlElement.className.split(' ');
+		if(splitted.length < 3)
+		{
+			alert('Unable to create connector \'' + id + '\', class is not in the correct format: connector <sourceBlockId>, <destBlockId>');
+			return;
+		}
+		
+		this.connectorClass = splitted[0] + ' ' + splitted[1] + ' ' + splitted[2];
+		
+		this.source = this.canvas.findBlock(splitted[1]);
+		if(!this.source)
+		{
+			alert('cannot find source block with id \'' + splitted[1] + '\'');
+			return;
+		}
+		
+		this.destination = this.canvas.findBlock(splitted[2]);
+		if(!this.destination)
+		{
+			alert('cannot find destination block with id \'' + splitted[2] + '\'');
+			return;
+		}
+		
+		// check preferred orientation
+		if(hasClass(this.htmlElement, 'vertical'))
+		{
+			this.preferredSourceOrientation = VERTICAL;
+			this.preferredDestinationOrientation = VERTICAL;
+		}
+		else if(hasClass(this.htmlElement, 'horizontal'))
+		{
+			this.preferredSourceOrientation = HORIZONTAL;
+			this.preferredDestinationOrientation = HORIZONTAL;
+		}
+		else
+		{
+			// check preferred orientation on source side
+			if(hasClass(this.htmlElement, 'vertical_start'))
+				this.preferredSourceOrientation = VERTICAL;
+			else if(hasClass(this.htmlElement, 'horizontal_start'))
+				this.preferredSourceOrientation = HORIZONTAL;
+			else if(hasClass(this.htmlElement, 'left_start'))
+				this.preferredSourceOrientation = LEFT;
+			else if(hasClass(this.htmlElement, 'right_start'))
+				this.preferredSourceOrientation = RIGHT;
+			else if(hasClass(this.htmlElement, 'up_start'))
+				this.preferredSourceOrientation = UP;
+			else if(hasClass(this.htmlElement, 'down_start'))
+				this.preferredSourceOrientation = DOWN;
+			
+			// check preferred orientation on destination side
+			if(hasClass(this.htmlElement, 'vertical_end'))
+				this.preferredDestinationOrientation = VERTICAL;
+			else if(hasClass(this.htmlElement, 'horizontal_end'))
+				this.preferredDestinationOrientation = HORIZONTAL;
+			else if(hasClass(this.htmlElement, 'left_end'))
+				this.preferredDestinationOrientation = LEFT;
+			else if(hasClass(this.htmlElement, 'right_end'))
+				this.preferredDestinationOrientation = RIGHT;
+			else if(hasClass(this.htmlElement, 'up_end'))
+				this.preferredDestinationOrientation = UP;
+			else if(hasClass(this.htmlElement, 'down_end'))
+				this.preferredDestinationOrientation = DOWN;
+		}
+		
+		// get the first strategy as default
+		this.strategy = strategies[0](this);
+		this.repaint();
+		
+		this.source.moveListeners.push(this);
+		this.destination.moveListeners.push(this);
+		
+		// call inspectors for this connector
+		var i;
+		for(i = 0; i < inspectors.length; i++)
+		{
+			inspectors[i].inspect(this);
+		}
+		
+		// remove old html element
+		this.htmlElement.parentNode.removeChild(this.htmlElement);
+	}
+	
+	this.getStartSegment = function()
+	{
+		return this.firstSegment;
+	}
+	
+	this.getEndSegment = function()
+	{
+		var s = this.firstSegment;
+		while(s.nextSegment)
+			s = s.nextSegment;
+		return s;
+	}
+	
+	this.getMiddleSegment = function()
+	{
+		if(!this.strategy)
+			return null;
+		else
+			return this.strategy.getMiddleSegment();
+	}
+	
+	this.createSegment = function()
+	{
+		var segment;
+		
+		// if the pool contains more objects, borrow the segment, create it otherwise
+		if(this.segmentsPool)
+		{
+			segment = this.segmentsPool;
+			this.segmentsPool = this.segmentsPool.detach();
+		}
+		else
+		{		
+			segment = new Segment(this.id + "_" + (this.segmentsNumber + 1), this.canvas.htmlElement);
+			segment.htmlElement.className = this.connectorClass;
+			if(!getStyle(segment.htmlElement, 'background-color'))
+				segment.htmlElement.style.backgroundColor = this.color;
+			segment.thickness = this.size;
+		}
+		this.segmentsNumber++;
+		
+		if(this.firstSegment)
+			this.firstSegment.append(segment);
+		else
+			this.firstSegment = segment;
+		segment.visible = true;
+		return segment;
+	}
+	
+	/**
+	 * Repaints the connector
+	 */
+	this.repaint = function()
+	{
+		// check strategies fitness and choose the best fitting one
+		var i;
+		var maxFitness = 0;
+		var fitness;
+		var s;
+		
+		// check if any strategy is possible with preferredOrientation
+		for(i = 0; i < strategies.length; i++)
+		{
+			this.clearSegments();
+			
+			fitness = 0;
+			s = strategies[i](this);
+			if(s.isApplicable())
+			{
+				fitness++;
+				s.paint();
+				// check resulting orientation against the preferred orientations
+				if((this.firstSegment.orientation & this.preferredSourceOrientation) != 0)
+					fitness++;
+				if((this.getEndSegment().orientation & this.preferredDestinationOrientation) != 0)
+					fitness++;
+			}
+			
+			if(fitness > maxFitness)
+			{
+				this.strategy = s;
+				maxFitness = fitness;
+			}
+		}			
+		
+		this.clearSegments();
+
+		this.strategy.paint();
+		this.firstSegment.draw();
+
+		// this is needed to actually hide unused html elements	
+		if(this.segmentsPool)
+			this.segmentsPool.draw();
+	}
+	
+	/**
+	 * Hide all the segments and return them to pool
+	 */
+	this.clearSegments = function()
+	{
+		if(this.firstSegment)
+		{
+			this.firstSegment.cascadeHide();
+			this.firstSegment.append(this.segmentsPool);
+			this.segmentsPool = this.firstSegment;
+			this.firstSegment = null;
+		}	
+	}
+		
+	this.onMove = function()
+	{
+		this.repaint();
+		
+		// notify listeners
+		var i;
+		for(i = 0; i < this.moveListeners.length; i++)
+			this.moveListeners[i].onMove();
+	}
+}
+
+var strategies = new Array();
+
+function ConnectorEnd(htmlElement, connector, side)
+{
+	this.side = side;
+	this.htmlElement = htmlElement;
+	this.connector = connector;
+	connector.canvas.htmlElement.appendChild(htmlElement);
+	// strip extension
+	if(this.htmlElement.tagName.toLowerCase() == "img")
+	{
+		this.src = this.htmlElement.src.substring(0, this.htmlElement.src.lastIndexOf('.'));
+		this.srcExtension = this.htmlElement.src.substring(this.htmlElement.src.lastIndexOf('.'));
+		this.htmlElement.style.zIndex = getStyle(this.connector.htmlElement, "z-index");
+	}
+	
+	this.orientation;
+	
+	this.repaint = function()
+	{
+		this.htmlElement.style.position = 'absolute';
+				
+		var left;
+		var top;
+		var segment;
+		var orientation;
+		
+		if(this.side == START)
+		{
+			segment = connector.getStartSegment();
+			left = segment.startX;
+			top = segment.startY;
+			orientation = segment.orientation;
+			// swap orientation
+			if((orientation & VERTICAL) != 0)
+				orientation = (~orientation) & VERTICAL;
+			else
+				orientation = (~orientation) & HORIZONTAL;
+		}
+		else
+		{
+			segment = connector.getEndSegment();
+			left = segment.getEndX();
+			top = segment.getEndY();
+			orientation = segment.orientation;
+		}
+		
+		switch(orientation)
+		{
+			case LEFT:
+				top -= (this.htmlElement.offsetHeight - segment.thickness) / 2;
+				break;
+			case RIGHT:
+				left -= this.htmlElement.offsetWidth;
+				top -= (this.htmlElement.offsetHeight - segment.thickness) / 2;
+				break;
+			case DOWN:
+				top -= this.htmlElement.offsetHeight;
+				left -= (this.htmlElement.offsetWidth - segment.thickness) / 2;
+				break;
+			case UP:
+				left -= (this.htmlElement.offsetWidth - segment.thickness) / 2;
+				break;
+		}
+		
+		this.htmlElement.style.left = Math.ceil(left) + "px";
+		this.htmlElement.style.top = Math.ceil(top) + "px";
+		
+		if(this.htmlElement.tagName.toLowerCase() == "img" && this.orientation != orientation)
+		{
+			var orientationSuffix;
+			switch(orientation)
+			{
+				case UP: orientationSuffix = "u"; break;
+				case DOWN: orientationSuffix = "d"; break;
+				case LEFT: orientationSuffix = "l"; break;
+				case RIGHT: orientationSuffix = "r"; break;
+			}
+			this.htmlElement.src = this.src + "_" + orientationSuffix + this.srcExtension;
+		}
+		this.orientation = orientation;
+	}
+	
+	this.onMove = function()
+	{
+		this.repaint();
+	}
+}
+
+function SideConnectorLabel(connector, htmlElement, side)
+{
+	this.connector = connector;
+	this.htmlElement = htmlElement;
+	this.side = side;
+	this.connector.htmlElement.parentNode.appendChild(htmlElement);
+		
+	this.repaint = function()
+	{
+		this.htmlElement.style.position = 'absolute';
+		var left;
+		var top;
+		var segment;
+
+		if(this.side == START)
+		{	
+			segment = this.connector.getStartSegment();
+			left = segment.startX;
+			top = segment.startY;
+			if(segment.orientation == LEFT)
+				left -= this.htmlElement.offsetWidth;
+			if(segment.orientation == UP)
+				top -= this.htmlElement.offsetHeight;
+				
+			if((segment.orientation & HORIZONTAL) != 0 && top < this.connector.getEndSegment().getEndY())
+				top -= this.htmlElement.offsetHeight;
+			if((segment.orientation & VERTICAL) != 0 && left < this.connector.getEndSegment().getEndX())
+				left -= this.htmlElement.offsetWidth;
+		}
+		else
+		{	
+			segment = this.connector.getEndSegment();
+			left = segment.getEndX();
+			top = segment.getEndY();
+			if(segment.orientation == RIGHT)
+				left -= this.htmlElement.offsetWidth;
+			if(segment.orientation == DOWN)
+				top -= this.htmlElement.offsetHeight;
+			if((segment.orientation & HORIZONTAL) != 0 && top < this.connector.getStartSegment().startY)
+				top -= this.htmlElement.offsetHeight;
+			if((segment.orientation & VERTICAL) != 0 && left < this.connector.getStartSegment().startX)
+				left -= this.htmlElement.offsetWidth;
+		}
+		
+		this.htmlElement.style.left = Math.ceil(left) + "px";
+		this.htmlElement.style.top = Math.ceil(top) + "px";
+	}
+	
+	this.onMove = function()
+	{
+		this.repaint();
+	}
+}
+
+function MiddleConnectorLabel(connector, htmlElement)
+{
+	this.connector = connector;
+	this.htmlElement = htmlElement;
+	this.connector.canvas.htmlElement.appendChild(htmlElement);
+	
+	this.repaint = function()
+	{
+		this.htmlElement.style.position = 'absolute';
+		
+		var left;
+		var top;
+		var segment = connector.getMiddleSegment();
+
+		if((segment.orientation & VERTICAL) != 0)
+		{
+			// put label at middle height on right side of the connector
+			top = segment.htmlElement.offsetTop + (segment.htmlElement.offsetHeight - this.htmlElement.offsetHeight) / 2;
+			left = segment.htmlElement.offsetLeft;
+		}
+		else
+		{
+			// put connector below the connector at middle widths
+			top = segment.htmlElement.offsetTop;
+			left = segment.htmlElement.offsetLeft + (segment.htmlElement.offsetWidth - this.htmlElement.offsetWidth) / 2;;
+		}
+		
+		this.htmlElement.style.left = Math.ceil(left) + "px";
+		this.htmlElement.style.top = Math.ceil(top) + "px";
+	}
+	
+	this.onMove = function()
+	{
+		this.repaint();
+	}
+}
+
+/*
+ * Inspector classes
+ */
+
+function ConnectorEndsInspector()
+{
+	this.inspect = function(connector)
+	{
+		var children = connector.htmlElement.childNodes;
+		var i;
+		for(i = 0; i < children.length; i++)
+		{
+			if(hasClass(children[i], "connector-end"))
+			{
+				var newElement = new ConnectorEnd(children[i], connector, END);
+				newElement.repaint();
+				connector.moveListeners.push(newElement);
+			}
+			else if(hasClass(children[i], "connector-start"))
+			{
+				var newElement = new ConnectorEnd(children[i], connector, START);
+				newElement.repaint();
+				connector.moveListeners.push(newElement);
+			}
+		}
+	}
+}
+
+function ConnectorLabelsInspector()
+{
+	this.inspect = function(connector)
+	{
+		var children = connector.htmlElement.childNodes;
+		var i;
+		for(i = 0; i < children.length; i++)
+		{
+			if(hasClass(children[i], "source-label"))
+			{
+				var newElement = new SideConnectorLabel(connector, children[i], START);
+				newElement.repaint();
+				connector.moveListeners.push(newElement);
+			}
+			else if(hasClass(children[i], "middle-label"))
+			{
+				var newElement = new MiddleConnectorLabel(connector, children[i]);
+				newElement.repaint();
+				connector.moveListeners.push(newElement);
+			}
+			else if(hasClass(children[i], "destination-label"))
+			{
+				var newElement = new SideConnectorLabel(connector, children[i], END);
+				newElement.repaint();
+				connector.moveListeners.push(newElement);
+			}
+		}
+	}
+}
+
+/*
+ * Inspector registration
+ */
+
+inspectors.push(new ConnectorEndsInspector());
+inspectors.push(new ConnectorLabelsInspector());
+
+/*
+ * an array containing all the canvases in document
+ */
+var canvases = new Array();
+
+/*
+ * This function initializes the js_graph objects inspecting the html document
+ */
+function initPageObjects()
+{
+	if(isCanvas(document.body))
+	{
+		var newCanvas = new Canvas(document.body);
+		newCanvas.initCanvas();
+		canvases.push(newCanvas);
+	}
+	else
+	{	
+		var divs = document.getElementsByTagName('div');
+		var i;
+		for(i = 0; i < divs.length; i++)
+		{
+			if(isCanvas(divs[i]) && !findCanvas(divs[i].id))
+			{
+				var newCanvas = new Canvas(divs[i]);
+				newCanvas.initCanvas();
+				canvases.push(newCanvas);
+			}
+		}
+	}
+}
+
+
+/*
+ * Utility functions
+ */
+
+
+function findCanvas(canvasId)
+{	
+	var i;
+	for(i = 0; i < canvases.length; i++)
+		if(canvases[i].id == canvasId)
+			return canvases[i];
+	return null;
+}
+
+function findBlock(blockId)
+{
+	var i;
+	for(i = 0; i < canvases.length; i++)
+	{
+		var block = canvases[i].findBlock(blockId);
+		if(block)
+			return block;
+	}
+	return null;
+}
+ 
+/*
+ * This function determines whether a html element is to be considered a canvas
+ */
+function isBlock(htmlElement)
+{
+	return hasClass(htmlElement, 'block');
+}
+
+/*
+ * This function determines whether a html element is to be considered a block
+ */
+function isCanvas(htmlElement)
+{
+	return hasClass(htmlElement, 'canvas');
+}
+
+/*
+ * This function determines whether a html element is to be considered a connector
+ */
+function isConnector(htmlElement)
+{
+	return htmlElement.className && htmlElement.className.match(new RegExp('connector .*'));
+}
+
+/*
+ * This function calculates the absolute 'top' value for a html node
+ */
+function calculateOffsetTop(obj)
+{
+	var curtop = 0;
+	if (obj.offsetParent)
+	{
+		curtop = obj.offsetTop
+		while (obj = obj.offsetParent) 
+			curtop += obj.offsetTop
+	}
+	else if (obj.y)
+		curtop += obj.y;
+	return curtop;
+}
+
+/*
+ * This function calculates the absolute 'left' value for a html node
+ */
+function calculateOffsetLeft(obj)
+{
+	var curleft = 0;
+	if (obj.offsetParent)
+	{
+		curleft = obj.offsetLeft
+		while (obj = obj.offsetParent) 
+		{
+			curleft += obj.offsetLeft;
+		}
+	}
+	else if (obj.x)
+		curleft += obj.x;
+	return curleft;
+}
+
+function parseBorder(obj, side)
+{
+	var sizeString = getStyle(obj, "border-" + side + "-width");
+	if(sizeString && sizeString != "")
+	{
+		if(sizeString.substring(sizeString.length - 2) == "px")
+			return parseInt(sizeString.substring(0, sizeString.length - 2));
+	}
+	return 0;
+}
+
+function hasClass(element, className)
+{
+	if(!element || !element.className)
+		return false;
+		
+	var classes = element.className.split(' ');
+	var i;
+	for(i = 0; i < classes.length; i++)
+		if(classes[i] == className)
+			return true;
+	return false;
+}
+
+/**
+ * This function retrieves the actual value of a style property even if it is set via css.
+ */
+function getStyle(node, styleProp)
+{
+	// if not an element
+	if( node.nodeType != 1)
+		return;
+		
+	var value;
+	if (node.currentStyle)
+	{
+		// ie case
+		styleProp = replaceDashWithCamelNotation(styleProp);
+		value = node.currentStyle[styleProp];
+	}
+	else if (window.getComputedStyle)
+	{
+		// mozilla case
+		value = document.defaultView.getComputedStyle(node, null).getPropertyValue(styleProp);
+	}
+	
+	return value;
+}
+
+function replaceDashWithCamelNotation(value)
+{
+	var pos = value.indexOf('-');
+	while(pos > 0 && value.length > pos + 1)
+	{
+		value = value.substring(0, pos) + value.substring(pos + 1, pos + 2).toUpperCase() + value.substring(pos + 2);
+		pos = value.indexOf('-');
+	}
+	return value;
+}
+
+
+/*******************************
+ * Connector paint strategies. *
+ *******************************/
+ 
+/**
+ * Horizontal "S" routing strategy.
+ */
+function HorizontalSStrategy(connector)
+{
+	this.connector = connector;
+	
+	this.startSegment;
+	this.middleSegment;
+	this.endSegment;
+	
+	this.strategyName = "horizontal_s";
+	
+	this.getMiddleSegment = function()
+	{
+		return this.middleSegment;
+	}
+	
+	this.isApplicable = function()
+	{
+		var sourceLeft = this.connector.source.left();
+		var sourceWidth = this.connector.source.width();
+		var destinationLeft = this.connector.destination.left();
+		var destinationWidth = this.connector.destination.width();
+		
+		return Math.abs(2 * destinationLeft + destinationWidth - (2 * sourceLeft + sourceWidth)) - (sourceWidth + destinationWidth) > 4 * this.connector.minSegmentLength;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = connector.createSegment();
+		this.middleSegment = connector.createSegment();
+		this.endSegment = connector.createSegment();
+		
+		var sourceLeft = this.connector.source.left();
+		var sourceTop = this.connector.source.top();
+		var sourceWidth = this.connector.source.width();
+		var sourceHeight = this.connector.source.height();
+		
+		var destinationLeft = this.connector.destination.left();
+		var destinationTop = this.connector.destination.top();
+		var destinationWidth = this.connector.destination.width();
+		var destinationHeight = this.connector.destination.height();
+		
+		var hLength;
+		
+		this.startSegment.startY = Math.floor(sourceTop + sourceHeight / 2);
+			
+		// deduce which face to use on source and destination blocks
+		if(sourceLeft + sourceWidth / 2 < destinationLeft + destinationWidth / 2)
+		{
+			// use left side of the source block and right side of the destination block
+			this.startSegment.startX = sourceLeft + sourceWidth;
+			hLength = destinationLeft - (sourceLeft + sourceWidth);
+		}
+		else
+		{
+			// use right side of the source block and left side of the destination block
+			this.startSegment.startX = sourceLeft;
+			hLength = destinationLeft + destinationWidth - sourceLeft;
+		}
+
+		// first horizontal segment positioning
+		this.startSegment.length = Math.floor(Math.abs(hLength) / 2);
+		this.startSegment.orientation = hLength > 0 ? RIGHT : LEFT;
+		
+		// vertical segment positioning			
+		var vLength = Math.floor(destinationTop + destinationHeight / 2 - (sourceTop + sourceHeight / 2));		
+		this.middleSegment.length = Math.abs(vLength);
+		if(vLength == 0)
+			this.middleSegment.visible = false;
+		this.middleSegment.orientation = vLength > 0 ? DOWN : UP;
+		
+		// second horizontal segment positioning
+		this.endSegment.length = Math.floor(Math.abs(hLength) / 2);
+		this.endSegment.orientation = hLength > 0 ? RIGHT : LEFT;
+	}
+}
+
+/**
+ * Vertical "S" routing strategy.
+ */
+function VerticalSStrategy(connector)
+{
+	this.connector = connector;
+	
+	this.startSegment;
+	this.middleSegment;
+	this.endSegment;
+	
+	this.strategyName = "vertical_s";
+	
+	this.getMiddleSegment = function()
+	{
+		return this.middleSegment;
+	}	
+	
+	this.isApplicable = function()
+	{
+		var sourceTop = this.connector.source.top();
+		var sourceHeight = this.connector.source.height();
+		var destinationTop = this.connector.destination.top();
+		var destinationHeight = this.connector.destination.height();
+		return Math.abs(2 * destinationTop + destinationHeight - (2 * sourceTop + sourceHeight)) - (sourceHeight + destinationHeight) > 4 * this.connector.minSegmentLength;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = connector.createSegment();
+		this.middleSegment = connector.createSegment();
+		this.endSegment = connector.createSegment();
+		
+		var sourceLeft = this.connector.source.left();
+		var sourceTop = this.connector.source.top();
+		var sourceWidth = this.connector.source.width();
+		var sourceHeight = this.connector.source.height();
+		
+		var destinationLeft = this.connector.destination.left();
+		var destinationTop = this.connector.destination.top();
+		var destinationWidth = this.connector.destination.width();
+		var destinationHeight = this.connector.destination.height();
+		
+		var vLength;
+		
+		this.startSegment.startX = 	Math.floor(sourceLeft + sourceWidth / 2);
+			
+		// deduce which face to use on source and destination blocks
+		if(sourceTop + sourceHeight / 2 < destinationTop + destinationHeight / 2)
+		{
+			// use bottom side of the source block and top side of destination block
+			this.startSegment.startY = sourceTop + sourceHeight;
+			vLength = destinationTop - (sourceTop + sourceHeight);
+		}
+		else
+		{
+			// use top side of the source block and bottom side of the destination block
+			this.startSegment.startY = sourceTop;
+			vLength = destinationTop + destinationHeight - sourceTop;
+		}
+		
+		// first vertical segment positioning
+		this.startSegment.length = Math.floor(Math.abs(vLength) / 2);
+		this.startSegment.orientation = vLength > 0 ? DOWN : UP;
+		
+		// horizontal segment positioning
+		var hLength = Math.floor(destinationLeft + destinationWidth / 2 - (sourceLeft + sourceWidth / 2));
+		this.middleSegment.length = Math.abs(hLength);
+		this.middleSegment.orientation = hLength > 0 ? RIGHT : LEFT;
+					
+		// second vertical segment positioning
+		this.endSegment.length = Math.floor(Math.abs(vLength) / 2);
+		this.endSegment.orientation = vLength > 0 ? DOWN : UP;
+	}
+}
+
+/**
+ * A horizontal "L" connector routing strategy
+ */
+function HorizontalLStrategy(connector)
+{
+	this.connector = connector;
+	
+	this.destination;
+	
+	this.startSegment;
+	this.endSegment;
+	
+	this.strategyName = "horizontal_L";
+	
+	this.isApplicable = function()
+	{
+		var destMiddle = Math.floor(this.connector.destination.left() + this.connector.destination.width() / 2);
+		var sl = this.connector.source.left();
+		var sw = this.connector.source.width();
+		var dt = this.connector.destination.top();
+		var dh = this.connector.destination.height();
+		var sourceMiddle = Math.floor(this.connector.source.top() + this.connector.source.height() / 2);
+
+		if(destMiddle > sl && destMiddle < sl + sw)
+			return false;
+		if(sourceMiddle > dt && sourceMiddle < dt + dh)
+			return false;
+		return true;
+	}
+	
+	/**
+	 * Chooses the longest segment as the "middle" segment.
+	 */
+	this.getMiddleSegment = function()
+	{
+		if(this.startSegment.length > this.endSegment.length)
+			return this.startSegment;
+		else
+			return this.endSegment;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = this.connector.createSegment();
+		this.endSegment = this.connector.createSegment();
+		
+		var destMiddleX = Math.floor(this.connector.destination.left() + this.connector.destination.width() / 2);
+		var sl = this.connector.source.left();
+		var sw = this.connector.source.width();
+		var dt = this.connector.destination.top();
+		var dh = this.connector.destination.height();
+		
+		this.startSegment.startY = Math.floor(this.connector.source.top() + this.connector.source.height() / 2);
+		
+		// decide which side of the source block to connect to
+		if(Math.abs(destMiddleX - sl) < Math.abs(destMiddleX - (sl + sw)))
+		{
+			// use the left face
+			this.startSegment.orientation = (destMiddleX < sl) ? LEFT : RIGHT;				
+			this.startSegment.startX = sl;
+		}
+		else
+		{
+			// use the right face
+			this.startSegment.orientation = (destMiddleX > (sl + sw)) ? RIGHT : LEFT;
+			this.startSegment.startX = sl + sw;
+		}
+		
+		this.startSegment.length = Math.abs(destMiddleX - this.startSegment.startX);
+		
+		// decide which side of the destination block to connect to
+		if(Math.abs(this.startSegment.startY - dt) < Math.abs(this.startSegment.startY - (dt + dh)))
+		{
+			// use the upper face
+			this.endSegment.orientation = (this.startSegment.startY < dt) ? DOWN : UP;
+			this.endSegment.length = Math.abs(this.startSegment.startY - dt);
+		}
+		else
+		{
+			// use the lower face
+			this.endSegment.orientation = (this.startSegment.startY > (dt + dh)) ? UP : DOWN;
+			this.endSegment.length = Math.abs(this.startSegment.startY - (dt + dh));
+		}
+	}
+}
+
+/**
+ * Vertical "L" connector routing strategy
+ */
+function VerticalLStrategy(connector)
+{
+	this.connector = connector;
+	
+	this.startSegment;
+	this.endSegment;
+	
+	this.strategyName = "vertical_L";
+	
+	this.isApplicable = function()
+	{
+		var sourceMiddle = Math.floor(this.connector.source.left() + this.connector.source.width() / 2);
+		var dl = this.connector.destination.left();
+		var dw = this.connector.destination.width();
+		var st = this.connector.source.top();
+		var sh = this.connector.source.height();
+		var destMiddle = Math.floor(this.connector.destination.top() + this.connector.destination.height() / 2);
+
+		if(sourceMiddle > dl && sourceMiddle < dl + dw)
+			return false;
+		if(destMiddle > st && destMiddle < st + sh)
+			return false;
+		return true;	
+	}
+	
+	/**
+	 * Chooses the longest segment as the "middle" segment.
+	 */
+	this.getMiddleSegment = function()
+	{
+		if(this.startSegment.length > this.endSegment.length)
+			return this.startSegment;
+		else
+			return this.endSegment;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = this.connector.createSegment();
+		this.endSegment = this.connector.createSegment();
+		
+		var destMiddleY = Math.floor(this.connector.destination.top() + this.connector.destination.height() / 2);
+		var dl = this.connector.destination.left();
+		var dw = this.connector.destination.width();
+		var st = this.connector.source.top();
+		var sh = this.connector.source.height();
+		
+		this.startSegment.startX = Math.floor(this.connector.source.left() + this.connector.source.width() / 2);
+		
+		// decide which side of the source block to connect to
+		if(Math.abs(destMiddleY - st) < Math.abs(destMiddleY - (st + sh)))
+		{
+			// use the upper face
+			this.startSegment.orientation = (destMiddleY < st) ? UP : DOWN;
+			this.startSegment.startY = st;
+		}
+		else
+		{
+			// use the lower face
+			this.startSegment.orientation = (destMiddleY > (st + sh)) ? DOWN : UP;
+			this.startSegment.startY = st + sh;
+		}
+		
+		this.startSegment.length = Math.abs(destMiddleY - this.startSegment.startY);
+		
+		// decide which side of the destination block to connect to
+		if(Math.abs(this.startSegment.startX - dl) < Math.abs(this.startSegment.startX - (dl + dw)))
+		{
+			// use the left face
+			this.endSegment.orientation = (this.startSegment.startX < dl) ? RIGHT : LEFT;
+			this.endSegment.length = Math.abs(this.startSegment.startX - dl);
+		}
+		else
+		{
+			// use the right face
+			this.endSegment.orientation = (this.startSegment.startX > dl + dw) ? LEFT : RIGHT;
+			this.endSegment.length = Math.abs(this.startSegment.startX - (dl + dw));
+		}
+	}
+}
+
+function HorizontalCStrategy(connector, startOrientation)
+{
+	this.connector = connector;
+	
+	this.startSegment;
+	this.middleSegment;
+	this.endSegment;
+	
+	this.strategyName = "horizontal_c";
+	
+	this.getMiddleSegment = function()
+	{
+		return this.middleSegment;
+	}	
+	
+	this.isApplicable = function()
+	{
+		return true;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = connector.createSegment();
+		this.middleSegment = connector.createSegment();
+		this.endSegment = connector.createSegment();
+		
+		var sign = 1;
+		if(startOrientation == RIGHT)
+			sign = -1;
+		
+		var startX = this.connector.source.left();
+		if(startOrientation == RIGHT)
+			startX += this.connector.source.width();
+		var startY = Math.floor(this.connector.source.top() + this.connector.source.height() / 2);
+		
+		var endX = this.connector.destination.left();
+		if(startOrientation == RIGHT)
+			endX += this.connector.destination.width();
+		var endY = Math.floor(this.connector.destination.top() + this.connector.destination.height() / 2);
+
+		this.startSegment.startX = startX;
+		this.startSegment.startY = startY;
+		this.startSegment.orientation = startOrientation;
+		this.startSegment.length = this.connector.minSegmentLength + Math.max(0, sign * (startX - endX));
+		
+		var vLength = endY - startY;
+		this.middleSegment.orientation = vLength > 0 ? DOWN : UP;
+		this.middleSegment.length = Math.abs(vLength);
+		
+		this.endSegment.orientation = startOrientation == LEFT ? RIGHT : LEFT;
+		this.endSegment.length = Math.max(0, sign * (endX - startX)) + this.connector.minSegmentLength;
+	}
+}
+
+function VerticalCStrategy(connector, startOrientation)
+{
+	this.connector = connector;
+	
+	this.startSegment;
+	this.middleSegment;
+	this.endSegment;
+	
+	this.strategyName = "vertical_c";
+	
+	this.getMiddleSegment = function()
+	{
+		return this.middleSegment;
+	}	
+	
+	this.isApplicable = function()
+	{
+		return true;
+	}
+	
+	this.paint = function()
+	{
+		this.startSegment = connector.createSegment();
+		this.middleSegment = connector.createSegment();
+		this.endSegment = connector.createSegment();
+		
+		var sign = 1;
+		if(startOrientation == DOWN)
+			sign = -1;
+		
+		var startY = this.connector.source.top();
+		if(startOrientation == DOWN)
+			startY += this.connector.source.height();
+		var startX = Math.floor(this.connector.source.left() + this.connector.source.width() / 2);
+		
+		var endY = this.connector.destination.top();
+		if(startOrientation == DOWN)
+			endY += this.connector.destination.height();
+		var endX = Math.floor(this.connector.destination.left() + this.connector.destination.width() / 2);
+
+		this.startSegment.startX = startX;
+		this.startSegment.startY = startY;
+		this.startSegment.orientation = startOrientation;
+		this.startSegment.length = this.connector.minSegmentLength + Math.max(0, sign * (startY - endY));
+		
+		var hLength = endX - startX;
+		this.middleSegment.orientation = hLength > 0 ? RIGHT : LEFT;
+		this.middleSegment.length = Math.abs(hLength);
+		
+		this.endSegment.orientation = startOrientation == UP ? DOWN : UP;
+		this.endSegment.length = Math.max(0, sign * (endY - startY)) + this.connector.minSegmentLength;
+	}
+}
+
+
+strategies[0] = function(connector) {return new HorizontalSStrategy(connector)};
+strategies[1] = function(connector) {return new VerticalSStrategy(connector)};
+strategies[2] = function(connector) {return new HorizontalLStrategy(connector)};
+strategies[3] = function(connector) {return new VerticalLStrategy(connector)};
+strategies[4] = function(connector) {return new HorizontalCStrategy(connector, LEFT)};
+strategies[5] = function(connector) {return new HorizontalCStrategy(connector, RIGHT)};
+strategies[6] = function(connector) {return new VerticalCStrategy(connector, UP)};
+strategies[7] = function(connector) {return new VerticalCStrategy(connector, DOWN)};
\ No newline at end of file