The desgin looks dreadful to me in both IE and Opera. A white square on a green background, with a pink elipse. The blue button overlap to the left, the text overlaps to the right. Did you mean it to look like this?
that the white ground with a pink elipse was what you had designed - that's what I'm seeing in IE, there aren't any green backgrounds or white squares. I also assumed that you intended the text and hover buttons to overflow the elipse.
You assumed correctly FE, although I have looked at the image provided by Pesala, I can neither find or see any reference which may have caused the green colour. Whilst it sit's in FP there is no green as in Pesala's picture.
With this type of design, I should also point out that a screen resolution of 1024*768 should be used in order to see the design as intended.
The button's aren't currently working as it's only a sketchy layout of what i'm looking to achieve, as yet it is all on one page (htm) & I intend to break it down into included page components.