What's wrong in my javascript

function BtnSelect_Click_Complete(values) {
            var ofiledname;
            //alert('aaa');
            ofieldname = gup('fieldname');
            if (ofieldname != null) {
                //alert(ofieldname + " : " + values[0] + " : " + values[1]);
                window.opener.SetLookup(opener.document, ofieldname, values[0], values[1]);
                window.opener.PopulateParticipant(values[0], ofieldname);
            }
            self.close();
        }

function gup( name )
{
    var regexS = "[\\?&]"+name+"=([^&#]*)";
    var regex = new RegExp( regexS );
    var tmpURL = window.location.href;
    var results = regex.exec( tmpURL );
    if( results == null )
        return "";
  else
    return results[1];
}