Just make a rectangle with the desired bg colour and set it to 'not visible' Then draw a hotspot and assign 'on mouse over' and 'on mouse out' actions to it.
It should be chekced otherwise the text moves over the backrgound on different screensizes. I don't understand why the text would move just because I add a GfxMenu object like you can see in the rar.
What is it that makes the texts move just because a GfxMenu object has been added to the page?
But if I don't choose top the background image isn't placed correctly.
For instance when I choose center it aligns in the center but the top part of the background image isn't shown and when I choose default the background image is shown completely but it is aligned to the left.