Floating form


This was the challenge.

Our client wanted a Skype like application that worked at 100% and sized with the browser.
Near the base we needed a form that was always on screen.
The application needed to be centred and I estimated 300px in width.
Should work in either IE or Firefox.

1) Work out how and why the solution is working.
2) Work out why there is a bug in IE - clue the screen does not centre correctly and the error is in the CS