function getInternetExplorerVersion()
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
{
	var rv = -1; // Return value assumes failure.
  	if (navigator.appName == 'Microsoft Internet Explorer')
  	{
		var ua = navigator.userAgent;
    	var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    	if (re.exec(ua) != null) {
      		rv = parseFloat( RegExp.$1 );
		}
  	}
  	return rv;
}

function checkVersion()
{
	var msg = "You're not using Internet Explorer.";
  	var ver = getInternetExplorerVersion();

  	if ( ver > -1 )
  	{
    	if ( ver >= 7.0 )
      		msg = "You're using a recent copy of Internet Explorer."
    	else {
      		msg = "You should upgrade your copy of Internet Explorer.  IE 6 is no longer supported on this page.";
      		alert( msg );
		}
	}
}

function DetectOpera()
{
   if (navigator.userAgent.toLowerCase().search("opera") > -1)   
   {
		return 1;
   } else {
      return -1;
   }
}