By setting the innerHTML of the icon, we tell browsers they can clean up the

memory associated with those images. This completes #581, and reduces the 
memory used by applications where adding and removing of many markers 
is used.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@2925 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Icon.js

@@ -52,6 +52,8 @@ OpenLayers.Icon.prototype = {
     },
     
     destroy: function() {
+        OpenLayers.Event.stopObserving(this.imageDiv.firstChild);
+        this.imageDiv.innerHTML = "";
         this.imageDiv = null;
     },