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";
    sitemap    = new Image; sitemap.src    = "images/sitemap2.gif";
    links      = new Image; links.src      = "images/links2.gif";
    help    = new Image; help.src    = "images/help2.gif";
    terms       = new Image; terms.src       = "images/terms2.gif";
    webmasters   = new Image; webmasters.src   = "images/webmasters2.gif";
}