browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;

if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<link rel='stylesheet' href='Style/ieStyles.css' type='text/css'>");
}

else {
document.write("<link rel='stylesheet' href='Style/allStyles.css' type='text/css'>");
}