if ((navigator.appVersion.indexOf("Mac") != -1)) {
document.write("<LINK REL='stylesheet' href='css_items/mac.css' TYPE='text/css'>");
} else if ((navigator.appName.indexOf("Netscape") != -1)) {
document.write('<LINK rel=stylesheet href="css_items/win_nn.css" type="text/css">');
} else {
document.write('<LINK rel=stylesheet href="css_items/win.css" type="text/css">');
}