browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;
if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("");
}
else if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 5)) {
document.write("");
}
else if (browser_type == "Netscape" && (browser_version >= 4)) {
document.write("");
}