Advertisement management
In this section  advertising banners and graphics are managed. The related form of this section contains this related items: the position of location at the site, the URL of banner, banner links, banner title, the banner ratio distribution, the total number of display, dimensions, border, description and items to disable the banner. Its format can be Banner image formats or Flash  . For each location in the site the user can  define  an unlimited number of banners. Because (a group of banners)can be defined .So you can put the number of banners and put the number of broadcasting them in the ratio item. For example:
Suppose we have 3 banners: A, B and C.At first A  broadcasts 3 times.Then B  broadcasts 2 times. The visitors will see first A for  3 times, then see B  for 2 times.

A: ratio number = 3
B: ratio number = 2