// Adapted from the:
	// Ultimate client-side JavaScript client sniff. 
	// (C) Netscape Communications 1999. Permission granted to reuse and distribute. 
	if (navigator.userAgent.indexOf("Mac") != -1 && 
		navigator.userAgent.indexOf("MSIE") != -1) {
		document.write("<link rel='stylesheet' type='text/css' href='main_net.ex.css'>");
	} else {
		document.write("<link rel='stylesheet' type='text/css' href='main.css'>");
	}