var browser
var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)
//if IE 4+
if (browser_type=="Microsoft Internet Explorer"&&browser_version >=4){
 document.write('<link rel="stylesheet" href="style.css" type="text/css">')    
}
//if NS 6 
if (browser_type=="Netscape"&&browser_version>=5){
document.write('<link rel="stylesheet" href="style-ns6.css" type="text/css">')
}
//if NS4+
if (browser_type=="Netscape"&&browser_version>=4 && browser_type=="Netscape"&&browser_version<5){
window.location="ns4.html"
}