Load random page on google web designer

I've been using GWD for a few months and I have a question, I dont know if it's possible to do in GWD:

I want the index.html file to load a different random page between 3 pages and when you hit reload load another random page and so on, the pages don't need to appear in order... I'm trying to find out how this can be done but I had no success so far, thanks for your help!