add: if (!ary) return -1;  
context: function arrayIndexOf (ary, elem){    for (var i in ary)        if (ary[i] == elem)            return i;    return -1;}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/ee3e81c9eee0bf8794a2af998756d3a96e8053ee/venkman-utils.js/buggy/extensions/venkman/resources/content/venkman-utils.js