rem: return (inst && inst.constructor && base && (inst.constructor.name == base.name)); 
add: return (inst && base && ((inst instanceof base) || (inst.constructor && (inst.constructor.name == base.name)))); 
context: function isinstance(inst, base){    /* Returns |true| if |inst| was constructed by |base|. Not 100% accurate,     * but plenty good enough for us. This is to work around the fix for bug     * 254067 which makes instanceof fail if the two sides are 'from'     * different windows (something we don't care about).     */    return (inst && inst.constructor && base &&            (inst.constructor.name == base.name));}
meta: 1567	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1567/bf0fd77618803c102091c799f21eb6ce924a5370/utils.js/clean/js/lib/utils.js