If you have a table inside another and the one at the back has, say a red background, if it's possible to make the inside table also have a background colour but slightly transparent so the background table colour could still be seen?
Did I explain myself clearly enough?
If not, could you make an image have a transparent colour and still get the same effect?
If this is a help.
The only way I can think if doing that is with images. Coz if you put another colour inside the inner table it's just going right over top of the one you have so thus you wouldn't be able to see it, I think... I have never had the time to ply around with tables in tables. Sorry if thats not a help.