Why does this work in IE and Firefox, but not in safari?

Why does this work in IE and Firefox, but not in safari?
(I know my coding is in a little mess, but I am trying to learn as i go, (I ham more of a designer than a coder.)

I have just learnt how to put the drop down menu in my html as home page, but when I go to look at them in different browsers, IE, Firefox works fine, but it errors in Safari (please look if you can.)

http://www.brandingdirection.co.uk/

ALSO:

How do you get the menu drop downs to link to another html page?

Please help if you can would be very grateful.

thanks

Jonathan

Fix the errors in your markup first, see http://validator.w3.org/check?uri=http%3A%2F%2Fwww.brandingdirection.co.uk%2F&charset=%28detect+automatically%29&doctype=Inline&group=0
How do you get the menu drop downs to link to another html page?

Add some real links instead of #
<a href="what-i-do.html">What I do</a>

Thanks very much:)

Also would you know have to add a mouse scroll to this coding, ie I want the mouse to scroll over a kind of iframe and images to go left or right depending on your mouse?

Thanks

Jon