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