if (navigator.platform.indexOf('Mac') > -1) {

	//mac

		if (navigator.appName.indexOf('Microsoft') > -1) {

		//explorer

		document.write('<LINK HREF="css/mac_ie.css" REL="styleSheet" TYPE="text/css">');

		} else {

		//netscape

		 document.write('<LINK HREF="css/mac_ns.css" REL="styleSheet" TYPE="text/css">');

		}

	} else {

	//windows or unix

		if (navigator.appName.indexOf('Microsoft') > -1) {

		//explorer

		document.write('<LINK HREF="css/win_ie_mod.css" REL="styleSheet" TYPE="text/css">');

		} else {

		//netscape

		document.write('<LINK HREF="css/win_ns.css" REL="styleSheet" TYPE="text/css">');

		}

	}