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 || macOSX) {
		if(isNS4 || isIE4) {
		document.write('<link rel="stylesheet" href="/entertainment/tv/microsites/B/bb5_celebrity/media/css/_bb_4.css">');
		} else {
		document.write('<link rel="stylesheet" href="/entertainment/tv/microsites/B/bb5_celebrity/media/css/_bb.css">');
		}
	} else {
	document.write('<link rel="stylesheet" href="/entertainment/tv/microsites/B/bb5_celebrity/media/css/_bb.css">');
	}