Problem with prev, next buttons in jcarousel

When customising a jcarousel component (link) I encountered a problem in IE6 (FF 3 was ok). I wanted to add my custom, smaller image buttons, but they were larger and inappriopate to the idea. It happend when button was enabled (disabled state was ok).

javascript:alert('TODO: FIXME') problem

While developing my application I found above error (Firefox and IE):

Zend based class for polish payment gateway Płatności.pl - MVC - Zend Framework

A two-day task while applying for a job.
It applies to specification but not tested in real world app.