browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var agent = navigator.userAgent;
if (agent.indexOf("Opera") > -1) {
document.writeln("");
}
else if ((browserVer >3) && (browserName == "Microsoft Internet Explorer")) {
document.writeln("");
}
else if ((browserVer >3) &&(browserName == "Netscape")) {
document.writeln("");
}