var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)
//if NS 6
if (browser_type=="Netscape"&&browser_version>=5)
      //window.location.replace("http://mozilla.org")
         document.write('<link rel="stylesheet" type="text/css" href="css/firefox.css">')
//if IE 4+
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4)
//window.location.replace("http://microsoft.com")
   document.write('<link rel="stylesheet" type="text/css" href="css/ie.css">')  //   
//if NS4+
else if (browser_type=="Netscape"&&browser_version>=4)
window.location.replace("http://www.netscape.com")
//Default goto page (NOT NS 4+ and NOT IE 4+)
else
//window.location="http://www.dynamicdrive.com"
      document.write('<link rel="stylesheet" type="text/css" href="css/firefox.css">')