slideShow with undefined pic

[L8P8]

Hi!

I´m doing a pege with a slide show that opens pictures in another window.
I´ve posted it on this page:
http://www.fc.lnu.se/~cp222bn/uppgift6/uppgift6.htm
(check out the source code)

My problem is that in the menu on the second page I get "Undefined" for pictures that I´ve not chosen. I don´t know how to get rid of it.
Any ideas?

The second thing is that I want text in the small boxes tha appears when I put the mouse over the pictures. I have tryed a lot of stuff, but can´t get it to work.

I would really appriciate some help!
Thank you!