browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion);
if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) {
     roll = 'true'; }
else { roll = 'false'; }
function over(img,ref) { if (roll == 'true') { document.images[img].src = ref; } }
function out(img,ref) { if (roll == 'true') { document.images[img].src = ref; } }
if (roll == 'true') {
    menu_home       = new Image; home.src       = "images/home_r.gif";
    menu_friends    = new Image; friends.src    = "images/friends_r.gif";
    menu_contact_us = new Image; contact_us.src = "images/contact_us_r.gif";

}