Dynamic Redirection

[cchhita]

Hi Everyone,
I am sure this is possible but cant think how.

Here is what I have done - I have created a site structure that looks like this:
Introduction (main site structure level)
about us (sublevel)
- article
Why choose Us (sub Level)
- article
Ethics (sub level)
- article

The reason I have created it this way is because I am using a dynamic Left hand side menu and I want each sub level to show up in the LHS menu.
In my Top Nav, I have an Introduction button which currently Points to the About Us article. If the client wants to change the order of the articles (and put Why Choose Us at the very top), I want to be able to change the default page the Introduction button points to. i.e. when you click introduction, it should now take you to Why choose us page and NOT About Us.

Hope that makes sense....
I cant seem to figure out how to create a dynamic redirect to do this automatically for me. My top nav is made up of images, so cant create a dynamic menu here.

Any ideas?

Thanks

Esentially what I would like to do is be able to link my top Nav to the first article in the structure, no matter what that article is.