var NN = navigator.appName == "Netscape";
var NN4 = NN && (navigator.userAgent.indexOf("Mozilla/4") != -1);
var NN6 = NN && (navigator.userAgent.indexOf("Mozilla/5.0") != -1);



var IE4 = navigator.userAgent.indexOf("MSIE 4") != -1;
var IE5 = navigator.userAgent.indexOf("MSIE 5") != -1;
var IE6 = navigator.userAgent.indexOf("MSIE 6") != -1;

link1 = '<link rel="stylesheet" href="../';
link2 = '" type="text/css">';

cssnn4 = 'nn.css';
cssnn6 = 'nn.css';
cssie4 = 'ie.css';
cssie5 = 'ie.css';
cssie6 = 'ie.css';

if (NN6) {
css = link1 + cssnn6 + link2;
document.write(css);
}
if (NN4) {
css = link1 + cssnn4 + link2;
document.write(css);
}
else
if (IE4) {
css = link1 + cssie4 + link2;
document.write(css);
}
else
if (IE5) {
css = link1 + cssie5 + link2;
document.write(css);
}
else
if (IE6) {
css = link1 + cssie6 + link2;
document.write(css);
}