var bName = navigator.appName.charAt(0);
if(navigator.appVersion.indexOf("Mac") > -1){
if( bName == "M"){
// Mac IE
document.writeln('');
}else{
//Mac else
document.writeln('');
}
}else{
if( bName == "M"){
// Windows IE
document.writeln('');
}else{
// Windows else
document.writeln('');
}
}