if (navigator.appVersion.indexOf("Mac") != -1) {
//mac-browsers
document.write('');
} else {
// PC
// Opera
if (navigator.userAgent.indexOf("Opera")!=-1){
document.write('');
}
//Netscape
else if (navigator.appName == 'Netscape') {
document.write('');
}
// IE
else {
document.write('');
}
}