This is kind of hard to explain.

I have an absolutely positioned floating secondary content box.

It works great in all occurrences.

Except, when you submit a form and don't fill out the fields (see here, and push send). The box expands to show the errors, and underneath the footer there is a blank space. The best example I can give is to see it in action (link above).

I've played with min-height and it didn't work too good. I'd also like to avoid expanding the footer with code in the event of form errors if I can help it.

Should I ditch the absolute positioning? And try with margins? Is there any other way to get it to work?