Can somebody with a NETSCAPE browser please go over to this page and click on the "Pay by credit card" graphic and report what happens.
http://www.karasxxx.com/guests/joinpage.shtml?
In my browser (Netscape Communicator 4.77 i.e. very latest stable-ish Netscape browser) it tries to DOWNLOAD a file to my PC called "txn.cgi"
If you get the same result from Netscape (or indeed any other non-IE browser) then you could be losing a lot of chances to make signups right now!