function msieversion()
{
   var ua = window.navigator.userAgent;
   var msie = ua.indexOf ( "MSIE " );

   if ( msie > 0 )      // If Internet Explorer, return version number
      return parseInt (ua.substring (msie+5, ua.indexOf (".", msie )));
   else                 // If another browser, return 0
      return 0;
}

function CheckBrowserVersion()
{
   if ( msieversion() >= 5 )
   {
      // Do nothing
   }
   else 
   {
	if ( msieversion() >= 4 )
	   document.location.href="DisplayMessage.asp?InvalidBrowserVersion=1";
	else
	{
	   document.location.href="DisplayMessage.asp?InvalidBrowserVersion=1";
	}
   }
    
  // Exit
  return false;
}