// -- to distinguish user's platform and brawser --
// -- mac --
if(navigator.appVersion.indexOf("Mac") > 1){
document.write('<LINK REL="Stylesheet" TYPE="text/css" href="/eng/css/style_mac.css">');
}
else{
    document.write('<LINK REL="Stylesheet" TYPE="text/css" href="/eng/css/style_win.css">');
}