function getInternetExplorerVersion()
	// Returns the version of Internet Explorer or a -1
	// (indicating the use of another browser).
	{
	  var rv = 999; // 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 check_browser_version()
	{
	 //alert("run code");
	 if( getCookie("ieversion") == "") {
		   var iever = getInternetExplorerVersion();
		   //alert(iever);
		   setCookie("ieversion", iever);
		   if(iever<7) {
			   alert("Site best viewed in IE 7 or above.");
		   }
	  }

	}
	
	function getCookie(c_name)
	{
	if (document.cookie.length>0)
	  {
	  c_start=document.cookie.indexOf(c_name + "=");
	  if (c_start!=-1)
		{
		c_start=c_start + c_name.length+1;
		c_end=document.cookie.indexOf(";",c_start);
		if (c_end==-1) c_end=document.cookie.length;
		return unescape(document.cookie.substring(c_start,c_end));
		}
	  }
	return "";
	}
	
	function setCookie(c_name,value,expiredays)
	{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+
	((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
	}
	
	function checkCookie()
	{
	username=getCookie('username');
	if (username!=null && username!="")
	  {
	  alert('Welcome again '+username+'!');
	  }
	else
	  {
	  username=prompt('Please enter your name:',"");
	  if (username!=null && username!="")
		{
		setCookie('username',username,365);
		}
	  }
	}