var cobj = tracker[id]; 
var cobj = that.tracker[id]; 
    that.cleanCacheObjs = function() {        var count = 0;        for(var id in that.tracker) {            var cobj = tracker[id];            if (cobj.node.ownerDocument.location === null) {                that.debug('cleaning %s', id);                delete cobj.node;                delete cobj.button;                delete that.tracker[id];            } else {                count += 1;            }        }        that.debuglog('tracker count:', count);    };
4040	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4040/ee7477d4cb21f1061eb10904065473a793bceb3d/itsalltext.js/buggy/chrome/content/itsalltext.js