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') {
    home    = new Image; home.src    = "images/home2.gif";
    signup    = new Image; signup.src    = "images/signup2.gif";
    login    = new Image; login.src    = "images/login2.gif";
    sites    = new Image; sites.src    = "images/sites2.gif";
    promo    = new Image; promo.src    = "images/promo2.gif";
    resources    = new Image; resources.src    = "images/resources2.gif";
    contact    = new Image; contact.src    = "images/contact2.gif";
}