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: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/fac5daefc78d7a659d5602b52d4717bd8738cb19/sidebarOverlay.js/buggy/suite/common/sidebar/sidebarOverlay.js