var isIE;
var isNS;
isIE = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) > "4");
isNS = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) > "4");
// isIE=false;
// isNS=false;
// alert("Browser");
// CheckBrowser();
// return;

function CheckBrowser()   {
//	  alert("isIE="+isIE);
//	  alert("isNS="+isNS);	  
      if (isIE == false && isNS == false)  {
         alert("Internet Explorer or Netscape (4.0 or higher), required!");
         return -1;	
    } 
}