Improving the accessibility of UserVoice

We are currently testing a Web site with real users and naturally we're requesting feedback. To that end we've signed up with UserVoice (their main site doesn't seem to be accessible in Firefox - not an issue, 23/07). You add some simple Javascript to your page, and the visitor sees a neat "Feedback" tab on the left or right. Click the tab with your mouse and a dialogue box pops up with a form for your comments.

A screen shot of the Feedback box
A screen shot of the Feedback dialogue box on blog.UserVoice.com - Firefox 3.