// PC
if (navigator.appVersion.indexOf("Win") != -1 ) {
// Netscape
if (navigator.appName == "Netscape")
document.write("");
// IE
else if (navigator.appName == "Microsoft Internet Explorer")
document.write("");
// Mac
} else if (navigator.appVersion.indexOf("Mac") != -1 ) {
// Netscape
if (navigator.appName == "Netscape")
document.write("");
// IE
else if (navigator.appName == "Microsoft Internet Explorer")
document.write("");
// sonst wie Internet Explorer auf PC
} else
document.write("");