Image Swap + Links

[Ezkimo_Pie]

Hiya,
So I have this website I'm doing for somebody that involves some javascipting, which I am the first to say is not something I'm good at.

Here's the problem:
I have 3 links that when clicked swap an image with another image. Then, each swapped image links to another page.

Here's what I got:
http://zacharynichols.com/test/swap.html

Which seems fine at first, but I need the links to change to a specific image, not just cycle through a list of three like they are doing. If you mess around you'll see what I mean. Click links more than once etc.

I probably need to just write or find a new script rather then attempting to fix this one, but any help would be appreciated.

Thanks
-Zach