You have a few odd things going on in your code. When you use absolute positioning on an element, it does not float - it's either/or. You have .wrapper fixed and I'm not sure why. You appear to have some divitis
going on too.
I have a good full height layout demo here
When posting code in the forum, please use the code tags, [code][/code] - available with the # button in the post edit window.
This will wrap your code in a scroll box which greatly helps the readability of your post.