if (self != top) top.location.href = window.location.href;

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 >= 4.0) { roll = 'true'; }
else { roll = 'false'; }

function rollover(img_name,img_src) { if (roll == 'true') { document[img_name].src=img_src; } }