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diff --git a/src/js/util/mxImageBundle.js b/src/js/util/mxImageBundle.js
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+/**
+ * $Id: mxImageBundle.js,v 1.3 2011-01-20 19:08:11 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxImageBundle
+ *
+ * Maps from keys to base64 encoded images or file locations. All values must
+ * be URLs or use the format data:image/format followed by a comma and the base64
+ * encoded image data, eg. "data:image/gif,XYZ", where XYZ is the base64 encoded
+ * image data.
+ * 
+ * To add a new image bundle to an existing graph, the following code is used:
+ * 
+ * (code)
+ * var bundle = new mxImageBundle(alt);
+ * bundle.putImage('myImage', 'data:image/gif,R0lGODlhEAAQAMIGAAAAAICAAICAgP' +
+ *   '//AOzp2O3r2////////yH+FUNyZWF0ZWQgd2l0aCBUaGUgR0lNUAAh+QQBCgAHACwAAAAA' +
+ *   'EAAQAAADTXi63AowynnAMDfjPUDlnAAJhmeBFxAEloliKltWmiYCQvfVr6lBPB1ggxN1hi' +
+ *   'laSSASFQpIV5HJBDyHpqK2ejVRm2AAgZCdmCGO9CIBADs=', fallback);
+ * graph.addImageBundle(bundle);
+ * (end);
+ * 
+ * Alt is an optional boolean (default is false) that specifies if the value
+ * or the fallback should be returned in <getImage>.
+ * 
+ * The image can then be referenced in any cell style using image=myImage.
+ * If you are using mxOutline, you should use the same image bundles in the
+ * graph that renders the outline.
+ * 
+ * The keys for images are resolved in <mxGraph.postProcessCellStyle> and
+ * turned into a data URI if the returned value has a short data URI format
+ * as specified above.
+ * 
+ * A typical value for the fallback is a MTHML link as defined in RFC 2557.
+ * Note that this format requires a file to be dynamically created on the
+ * server-side, or the page that contains the graph to be modified to contain
+ * the resources, this can be done by adding a comment that contains the
+ * resource in the HEAD section of the page after the title tag.
+ * 
+ * This type of fallback mechanism should be used in IE6 and IE7. IE8 does
+ * support data URIs, but the maximum size is limited to 32 KB, which means
+ * all data URIs should be limited to 32 KB.
+ */
+function mxImageBundle(alt)
+{
+	this.images = [];
+	this.alt = (alt != null) ? alt : false;
+};
+
+/**
+ * Variable: images
+ * 
+ * Maps from keys to images.
+ */
+mxImageBundle.prototype.images = null;
+
+/**
+ * Variable: alt
+ * 
+ * Specifies if the fallback representation should be returned.
+ */
+mxImageBundle.prototype.images = null;
+
+/**
+ * Function: putImage
+ * 
+ * Adds the specified entry to the map. The entry is an object with a value and
+ * fallback property as specified in the arguments.
+ */
+mxImageBundle.prototype.putImage = function(key, value, fallback)
+{
+	this.images[key] = {value: value, fallback: fallback};
+};
+
+/**
+ * Function: getImage
+ * 
+ * Returns the value for the given key. This returns the value
+ * or fallback, depending on <alt>. The fallback is returned if
+ * <alt> is true, the value is returned otherwise.
+ */
+mxImageBundle.prototype.getImage = function(key)
+{
+	var result = null;
+	
+	if (key != null)
+	{
+		var img = this.images[key];
+		
+		if (img != null)
+		{
+			result = (this.alt) ? img.fallback : img.value;
+		}
+	}
+	
+	return result;
+};