Site - Internet Explorer issue

I'm a newbie at coding. I've put together a site for a friend - ( http://www.testdrive-site.co.uk/site2 )
It has links along the top that slide you along to various sections of a v. wide horizontal page. It works fine in Firefox etc but nothing happens in Internet Explorer.

Any ideas?

Thanks.
:confused:

Probably should have posted this over in the 'frameworks' forum ...

Will do, thanks