if (navigator.platform.indexOf('Mac')!=-1) {
if (navigator.appName.indexOf('Netscape')!=-1) {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/mac_ns.css">');
} else if  (navigator.appName.indexOf('Microsoft')!=-1) {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/mac_ie.css">');
} else {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/mac_ie.css">');
}
} else if (navigator.platform.indexOf("Win")!=-1) {
if (navigator.appName.indexOf('Netscape')!=-1) {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/win_ns.css">');
} else if  (navigator.appName.indexOf('Microsoft')!=-1) {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/win_ie.css">');
} else {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/win_ie.css">');
}
} else {
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../css/win_ie.css">');
}
<!--//
if (navigator.appVersion > "3") {
    img01 = new Image(); img01.src = "../img/menu01a.gif";
    img02 = new Image(); img02.src = "../img/menu01b.gif";
    img03 = new Image(); img03.src = "../img/menu02a.gif";
    img04 = new Image(); img04.src = "../img/menu02b.gif";
    img05 = new Image(); img05.src = "../img/menu03a.gif";
    img06 = new Image(); img06.src = "../img/menu03b.gif";
    img07 = new Image(); img07.src = "../img/menu04a.gif";
    img08 = new Image(); img08.src = "../img/menu04b.gif";
}
function imgChange(imgName,imgNum) {
    if (navigator.appVersion > "3") {
        document.images[imgName].src = eval(imgNum + ".src");
    }
}