var n = navigator;
var ua = ' ' + n.userAgent.toLowerCase();
pl = n.platform.toLowerCase();
mac = ua.indexOf('mac') > 0;
macOSX = (ua.indexOf('os x') > 0 || ua.indexOf('mac_powerpc') > 0);
mac68k = (ua.indexOf('68k') > 0 || ua.indexOf('68000') > 0);
macppc = (ua.indexOf('ppc') > 0 || ua.indexOf('powerpc') > 0);
isNS4 = (document.layers) ? true : false;
isIE4 = (document.all && !document.getElementById) ? true : false;
isIE5 = (document.all && document.getElementById) ? true : false;
isNS6 = (!document.all && document.getElementById) ? true : false;
if(mac || mac68k || macppc) {
	if(isNS4 || isIE4) {
	document.write('<link rel="stylesheet" href="/images/nav_mac.css">');
	} else {
	document.write('<link rel="stylesheet" href="/images/nav_mac.css">');
	}
} else {
	if(isNS6) {
	document.write('<link rel="stylesheet" href="/images/nav_ns.css">');
	} else {
	document.write('<link rel="stylesheet" href="/images/nav.css">');
	}
}