function choose() {
	ft=document.file.chooser.value;
	if (ft.length>12)
	{
		if (ft.substring(ft.length-11,ft.length)=="geonext.jar")
		{
		
			tr=ft.substring(0,ft.length-12);
  			window.document.open("content/example/ex.html?PTH=file:/"+tr,"_blank","location=yes,menubar=yes,status=yes,resizable=yes");
		}
		else
			alert('Sorry :-(');
	}
			else
			alert('Sorry :-(');

 }