if (parseInt(navigator.appVersion) >= 4) {
var IE4 = (navigator.appVersion.indexOf("MSIE") > 0);
var NN4 = (navigator.appName == "Netscape");
var OS;
if (navigator.appVersion.indexOf("Win") > 0) {OS = "Windows";}
if (navigator.appVersion.indexOf("Mac") > 0) {OS = "MacOS";}
switch (OS) {
case "Windows":
if (IE4 > 0) {
document.write("");
}
if (NN4 > 0) {
document.write("");
}
break;
case "MacOS":
if (IE4 > 0) {
document.write("");
}
if (NN4 > 0) {
document.write("");
}
break;
}
}