var isSafari = (navigator.userAgent.indexOf("Safari") != -1);
	var isMSIE = (navigator.userAgent.indexOf("MSIE") != -1);
	var isGecko = (navigator.userAgent.indexOf("Gecko") != -1);

	if (isSafari)
		document.write("<link rel='stylesheet' type='text/css' href='styles/style.css'/>");

	if (isGecko)
		document.write("<link rel='stylesheet' type='text/css' href='styles/style_ns.css'/>");

	if (isMSIE)
		document.write("<link rel='stylesheet' type='text/css' href='styles/style_ie.css'/>");