Tabbing in ie6

Hi,
I have 2 pages with the tabbing functionality in them.
On the first page, the tabs “global positioning one, two etc” work. Except for the images disappearing in tab 2 and 3. The images are displayed exactly as the first one is. I don’t know why it they disappear.

On this page, the green tabs are suppose to work just as the ones on the first page. But they do not do anything.

It’s only in ie6. Both pages work fine in ie7 and FF.
Any suggestions? Thanks