if ((navigator.userAgent.indexOf("Mac") != -1))  
		document.write("<link rel='stylesheet' href='/style/mbmac.css'>")  
if (navigator.userAgent.indexOf('Win') != -1){  
		if (navigator.appName.indexOf('Netscape') != -1) { 
			document.write("<link rel='stylesheet' href='/style/mbnav.css'>") 
				} 
				else {  
					document.write("<link rel='stylesheet' href='/style/mbie.css'>")

				} 
			}