Nivo Slider link issue

I tried to implement a Nivo Slider inside my BC site following a nice tutorial by Wil Helser

(http://www.wilhelser.com/2011/05/add-dynamic-nivo-slider-business-cata lyst-site/)

The idea is to create a Web App with 3 fields: Image, Caption and URL which displays pictures with captions inside the slider.

Easy to do but for one small detail.

I want the slider's pictures to be clickable.

But I do not have any specific URL because the pages (with the picture) are created by another Web App.

I tried the URL address of the page 'after' it is created (for ex. after a web app search) but I get a 404 page not found.

I wonder if some kind of module tag could solve the problem…