var appname = navigator.appName; 
var version = parseInt(navigator.appVersion); 

if (navigator.userAgent.lastIndexOf("Win") >= 0) { 
var platform = "pc"; 
} 
else if (navigator.userAgent.lastIndexOf("Mac") >= 0) {
var platform = "mac"; 
} 
if ((appname == "Netscape" && version >= 3) || (appname == "Microsoft Internet Explorer" && version >= 3) ) { 
if (platform == "pc") { 


// ENTER THE PC STYLESHEET LINK HERE:
var linkrel = "<link rel=\"stylesheet\" href=\"/stylesheets/branch_pc.css\">"; 
}

// ENTER THE MAC STYLESHEET LINK HERE:
else { 
var linkrel = "<link rel=\"stylesheet\" href=\"/stylesheets/branch_mac.css\">"; 
} 
document.write(linkrel); 
}