var browsername=navigator.appName;
var massima=parseInt(navigator.appVersion);
	
	if ((browsername.indexOf("Netscape")!=-1)&&(massima<5))
        {
	document.write ('<link rel=\"stylesheet\" href=\"/stili/net.css\">');	
        } else
        {
	document.write ('<link rel=\"stylesheet\" href=\"/stili/exp.css\">');	
	}