var Opera = (navigator.userAgent.indexOf('Opera') != -1);
var MSIE = (navigator.userAgent.indexOf('MSIE') != -1);
var Moz = (navigator.userAgent.indexOf('Gecko') != -1);
var NS = (navigator.userAgent.indexOf('Netscape') != -1 && navigator.userAgent.indexOf('Gecko') != -1);
if (Opera && MSIE || Opera){document.write('<link rel="stylesheet" href="menu_op.css" title="original" />');}
if (Opera && MSIE || Opera){document.write('<link rel="alternate stylesheet" href="menu_op_q3a.css" title="quake3" />');}
if (Opera && MSIE || Opera){document.write('<link rel="alternate stylesheet" href="menu_op_sc.css" title="starcraft" />');}

if (NS || Moz){document.write('<link rel="stylesheet" href="menu_ns.css" title="original" />');}
if (NS || Moz){document.write('<link rel="alternate stylesheet" href="menu_ns_q3a.css" title="quake3" />');}
if (NS || Moz){document.write('<link rel="alternate stylesheet" href="menu_ns_sc.css" title="starcraft" />');}