this.isAncestor = function(node, potentialAncestor){    for (var parent = node; parent; parent = parent.parentNode)    {        if (parent == potentialAncestor)            return true;    }        return false;};
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/8237a6359bebacf3e34f1134ef713c687c8e3edb/lib.js/clean/extension/content/firebug/lib.js