return results.length > 0 ? results : null; 
return results; 
function eval_css(css, inDocument){    var results = cssQuery(css, inDocument);    return results.length > 0 ? results : null;}
4983	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4983/d1319b62eeb691ccd575cc3d308ad1b9672a4351/ui-element.js/clean/src/content/ui-element.js