On the second link above the footer hasn't cleared the left content because you have absolutely placed some of those items in the left content. There is no way to clear absolute elements (without scripting) so you need to change those elements to statically placed elements as there is no need for the main part of them to be absolute.

Obviously the decoration images etc can be absolutely placed but the main content can be static and take up space on the page. The left column is floated left so you should just stack your content in that column logically and without the need for absolute positioning.

Absolute elements exist in their own little world and have scant regard for anything else on the page. Therefore when you use absolute positioning you have to make sure that you are not going to add things like footers that need to react to the absolute elements height.

Hope that makes sense.