    onMouseOver: function(event)    {        var sourceLine = getAncestorByClass(event.target, "sourceLine");        if (sourceLine)        {            if (this.hoveredLine)                removeClass(this.hoveredLine.parentNode, "hovered");                        this.hoveredLine = sourceLine;                        if (sourceLine)                setClass(sourceLine.parentNode, "hovered");        }            },
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/8237a6359bebacf3e34f1134ef713c687c8e3edb/debugger.js/buggy/extension/content/firebug/debugger.js