I have a form that once you select from a drop-down list and select submit, it is suppose to open up to a new window

Here is the code that is currently on the page and I think it needs to be completely wiped out or revised, it only works in IE and Firefox

<SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript"> 
//<!-- Hide JavaScript from older browsers 
//  Function to open a window
function windowOpen(window_url) {
   helpWin = window.open(window_url,'','toolbar=yes,status=no,scrollbars=yes,menubar=yes,resizable=yes,directories=no,location=no,width=350,height=400');
   if (document.images) { 
       if (helpWin) helpWin.focus()
   }
}
//  End script hiding --> 
</SCRIPT>