var BROWSER_NAME = navigator.appName;
var plat = navigator.appVersion;

if (BROWSER_NAME == "Netscape" && plat.indexOf("Win") != -1) {
document.write('<LINK rel="stylesheet" href="net_win.css" type="text/css">');
} else 

if (BROWSER_NAME == "Microsoft Internet Explorer" && plat.indexOf("Win") != -1){
document.write('<LINK rel="stylesheet" href="IE_win.css" type="text/css">');
} else 

if (BROWSER_NAME == "Netscape" && plat.indexOf("Mac") != -1) {
document.write('<LINK rel="stylesheet" href="net_mac.css" type="text/css">');
} else 

if (plat.indexOf("Mac") != -1 && plat.indexOf("MSIE 5") != -1) {
document.write('<LINK rel="stylesheet" href="IE5_mac.css" type="text/css">');
} else {
document.write('<LINK rel="stylesheet" href="IE_mac.css" type="text/css">');
}