I am a complete newbie who is putting together a website from a commercial template. The site looks fine in IE, Firefox and Chrome but looks a complete mess in Opera. The original template was fine in Opera but I must have done something weird along the way. Can someone please help? I'm not sure if it's an HTML or CSS issue.

Also, our logo is somewhat bigger than the test.gif. If I try and put it on the page the tabs start jumping around. Is there some way I can fix this?

The page is http://www.sciencealive.co.nz/test/testhome

None of the links work yet as I have only uploaded the one page.

Thanks in advance.