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 overact(img,ref) { if (roll == 'true') { document.images[img].src = eval(img+'.src'); } }
function outact(img,ref)  { if (roll == 'true') { document.images[img].src = ref; } }

if (roll == 'true')
{
image_a=new Image;image_a.src="/i/activemedia_a.gif";
}