100% Image height problems

Hi all,

I have this template in which I am attempting to use 100% image heights on two images to stretch to the height of the page no matter how tall it becomes, For some reason it wasn’t working at first but through the use of the “background tag” on a td it works in a very messy non compliant way.

So now I’m trying to clean it up with not much success, clearly I am doing something very wrong.