This is the fast lane checkout. It has its own home template. Check in modules. It doesn't load the css files for some reason that's why you get this
Here is the error form FF (IE is similar)
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /skin1/main.FF.css was not found on this server.</p>
<hr>
<address>Apache/2.2.3 (Red Hat) Server at sleepywings.co.uk Port 80</address>
</body></html>