It seems as though I should have by now but I have never made an ad/banner rotator~
My main question is how would I apply a banner weighting system ... what would be the logic for that?
e.g. I want ads marked as `class 1` to show far more often than those in `class 2,3` etc but still keep some random element.
All ad data is kept in a db which I can change since I am in the early stages of development, any pointers appreciated.