function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (
aQueryString[iParam].indexOf(strParamName.toLowerCase() + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return unescape(strReturn);
}

function changesrc(element_id) {
	var preSelect2 = getURLParam('preSelect');
	if (preSelect2 != "" && document.getElementById(element_id).src.search(preSelect2) == -1) {
		document.getElementById(element_id).src = document.getElementById(element_id).src + "?preSelect="+preSelect2;
		//document.getElementById(element_id).contentDocument.location.reload(true);
		//alert(document.getElementById(element_id).src);
		//var iframe = document.getElementById('iiframe');
		//var innerDoc = iframe.contentDocument || iframe.contentWindow.document;
		//innerDoc.all.textfield3.value = preSelect2;
		//alert(innerDoc.all.textfield3.value);
	}
}