function macCss(){
if (navigator.userAgent.indexOf("Macintosh") != -1) {
if (navigator.userAgent.indexOf("Safari") != -1) {
document.write('');
}
}
if (navigator.userAgent.indexOf("Macintosh") != -1) {
if (navigator.userAgent.indexOf("Firefox") != -1) {
document.write('');
}
}
}
macCss();