var nn = (navigator.appName == "Netscape");
var win = (navigator.userAgent.indexOf("Win")!=-1)
var browserversion = navigator.appVersion.substring(0,3)

//alert(nn);
//alert(win);
//alert(browserversion);

if (nn && win)
document.write('<LINK REL=STYLESHEET HREF="css/nn.css" TYPE=text/css>');

if (nn && !win)
document.write('<LINK REL=STYLESHEET HREF="css/mac_nn.css" TYPE=text/css>');

if (!nn && win)
document.write('<LINK REL=STYLESHEET HREF="css/ie.css" TYPE=text/css>');

if (!nn && !win)
document.write('<LINK REL=STYLESHEET HREF="css/mac_ie.css" TYPE=text/css>');