Acheiving Full Height Columns with a Liquid Layout

I have a question! I am making a liquid layout and I can't seem to get my columns to go to full height for me. I am little confused on how I can achieve this with a liquid layout? I know faux columns and tried and can't get to work. It throws the layout all of wack. Can some please help!!!

Thanks,

Chris

are they supposed to be 100% of the browser or 100% of a containing div?
have you tried:

I want them if there is more content in the left column than the right they still touch the footer same for the mainbody of the site where the news and such is. My site is load through php because I use Joomla to run my site. I want all three columns to be even. I have a header image at the top and a image at the bottom for the footer they 960px in width.