var browser=navigator.appName;
var version=navigator.appVersion;
var agent=navigator.userAgent;

if((browser=="Netscape" || browser=="Microsoft Internet Explorer") && (parseInt(version)<=4))
{
document.write('<link rel="stylesheet" type="text/css" href="formate_ns.css">');
}
else
{
document.write('<link rel="stylesheet" type="text/css" href="formate.css">');
}