Ooo, oo, I may be of some use. It depends on what type of banner it is (i.e.; video, flash, size, etc;)(Well, there are those options with Google Ads), how often the page is visited and how often the ad is clicked.
So, your gonna be paid a small percent for every click and every load the ad gets. I know there's a bit more to it than that, but tha's all I can currently recall.
So when the banners do get put up; every now and then click one of them to give it some traffic.