rem: OnChange : function(src,prop,old_target,new_target) {}, 
add: OnChange : function(src,prop,old_target,new_target) { debug ("*** sidebar observer: change"); }, 
context:   OnChange : function(src,prop,old_target,new_target) {},
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/8bd01326a3d5f218e6b8becb7294cf0e0374f6b9/sidebarOverlay.js/buggy/xpfe/components/sidebar/resources/sidebarOverlay.js