valor = navigator.userAgent;
browser = navigator.appName;

if (valor.indexOf("Mac") != -1) { // Mac
	document.write('<LINK REL="STYLESHEET" HREF="https://www.ict-facil.com/css/iexp.css" TYPE="text/css">');			
	}

if (valor.indexOf("Win") != -1) { // Windows

	if (browser.indexOf("Explorer") != -1) {
		document.write('<LINK REL="STYLESHEET" HREF="https://www.ict-facil.com/css/iexp.css" TYPE="text/css">');		
		}

		else {
		document.write('<LINK REL="STYLESHEET" HREF="https://www.ict-facil.com/css/net.css" TYPE="text/css">');
		}

	}