Try to modify your template this way:
All the images should be used as a
background for cells (the hard way is by using CSS code).
Use small slices of background images to fill the area that you want to obtain self expanding areas and a "liquid" design.
The "height" tag causes a lot of trouble.
Also it's easyer to ask an expert to do it,

but it will cost you!
Good luck.
PS. Next time try to use a Mambo template (modify it) or make yourself one from scratch, by slicing images you get in trouble.