Below are some of the standard flash banner sizes used on web pages. it is a sort of convention to develop flash banners based on these sizes; however, we are not bound by these dimensions, as it were. two other sizes for flash banners are also in use: 350x300 and 720x300. these are generally not used on web pages but as pop-up or pop-under ads displayed on separate browser windows.
The sizes for flash banners have been formulated by the internet advertising bureau.