var name = navigator.appName;
var vers = navigator.appVersion;
vers = vers.substring(0,1); // or 0,4  could return 4.5 instead of just 4

if (name == "Netscape" && vers == "4") 
document.write('<LINK REL=stylesheet HREF="../style-ns.css" TYPE="text/css">');
else 
document.write('<LINK REL=stylesheet HREF="../style-ie.css" TYPE="text/css">');

// This script will choose the CSS (stylesheet) to use based on browser