var browser=navigator.appName;

	if (browser == "Microsoft Internet Explorer"){
	
		document.write('<LINK href="js/style1.css" rel="stylesheet" type="text/css">');
		
		
	}else if (browser == "Netscape"){
		
		var versione=parseInt(navigator.appVersion.substring(0,1));	

			if(versione==4){
							
				var piattaforma=navigator.userAgent;	
				
				if(piattaforma.indexOf("Windows")){
					document.write('<LINK href="js/style3.css" rel="stylesheet" type="text/css">');

				}else if (piattaforma.indexOf("Macintosh")) {
					
					document.write('<LINK href="/css/style2.css" rel="stylesheet" type="text/css">');
				}
		
			}else{
			
				document.write('<LINK href="/css/style1.css" rel="stylesheet" type="text/css">');
			}

	}