If user is using Internet Explorer 6.0 or 7.0 then clicking on checkout button cause empty page with that error:
Line: 424
Char: 19
Error: 'b' is null or not an object
Code: 0
URL: https://ipaddres:8443/konakart/D844C0524A8B6A84E42C85AFD59875A1.cache.html
Firefox 3.5.7 and IE 8.0 is working correctly.
Thanks for reporting this problem.
You can download a patch from our known problems page:
http://www.konakart.com/downloads/known-problems (http://www.konakart.com/downloads/known-problems)