var name = navigator.appName.toLowerCase();
var ver = navigator.appVersion.toLowerCase();
if (name == "microsoft internet explorer" && ver >="3") {
// browser is IE, version 3 or greater
if (ver.indexOf("mac") != -1) {
// platform is Macintosh
document.write('');
} else {
// platform is something else, probably Windows
document.write('');
}
} else if (name == "netscape" && ver >="3") {
// browser is Navigator, version 3 or greater
if(ver.indexOf("mac") != -1) {
// platform is Macintosh
document.write('');
} else {
// platform is something else, probably Windows
document.write('');
}
} else {
// default style sheet
document.write('');
}