problems with ie5 and aol 7

hi there
just done a trial on browsercam.com and i've noticed some rather nasty errors on my site when viewing with ie5 and aol 7

check it out

http://www.browsercam.com/public.aspx?proj_id=21794

sorry there's millions on there...

the site is www.herbal-factory.co.uk

specifically my problems are the search box and other things on the top right, and the navbar at the top...

if anyone could point me to something i can read to fix these nasty errors I would be extremely grateful

cheers

danny