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 );
  }
  
  if(navigator.appName == 'Opera'){
   rv=2;
  }
  
  return rv;
}



// open hidden layer
function checkMyVersion(){	
	var isIE=getInternetExplorerVersion();
	
		if(isIE==6){
			document.getElementById('versionMessage').style.display="block";
		}

	}