Your example page is built kind of wierd. Each section of the form is absolute positioned for the top of the page. I'm not sure why they would break the form up into sections to position each section, let alone use absolute positioning like they did.
Check out this fiddle. The red box is the form, the green box is a container that the form is absolute positioned to, the yellow box is the content area, and the blue box is the banner area.
Your example page is built kind of wierd. Each section of the form is absolute positioned for the top of the page. I'm not sure why they would break the form up into sections to position each section, let alone use absolute positioning like they did.
Check out this fiddle. The red box is the form, the green box is a container that the form is absolute positioned to, the yellow box is the content area, and the blue box is the banner area.