function checkBrowser(){

	checkIEVersion();

	/*if( navigator.appName != "Microsoft Internet Explorer"){
		document.getElementById("adv-css").href = "/styles/advertiles-ff.css";	
		alert('Mozilla or Chrome!');	
	}else{
	
			checkIEVersion();
	} */
}



function getInternetExplorerVersion(){
	//returns the version of Internet Explorer or a -1 (indicating the user use another browser)

	var ieVersion = -1 
	if(navigator.appName == "Microsoft Internet Explorer"){
		var userAgent = navigator.userAgent;
		var regExp = new RegExp("MSIE (\\d+[\\.\\d]*)");	//another version is "MSIE ([0-9]{1,}[\.0-9]{0,})"
	
		if(regExp.exec(userAgent) != null){
			ieVersion = parseFloat(RegExp.$1);				//get the value of the first group in the regular expression
		}
	}

	return ieVersion;
}


function checkIEVersion(){

	var msg = "";
	var version = getInternetExplorerVersion();
	
	if(version >= 8.0){
		msg = "You're using Windows Internet Explorer 8";
	}else if(version == 7.0){
		msg = "You're using Windows Internet Explorer 7";
		document.getElementById("adv-css").href = "/styles/advertiles-ie7.css";	
	}else if(version == 6.0){
		msg = "You're using Windows Internet Explorer 6";
	}else if(version == -1){
		msg = "You're not using Windows Internet Explorer"
	}else{
		msg = "You should upgrade your copy of Windows Internet Explorer 6";
	}
	
	//alert(msg);
	//alert('app name: ' + navigator.appName);
	//alert('user agent: ' + navigator.userAgent);

}