Administration can refuse you placing your banner without any explanations.
Banner format: gif, jpeg, png, flash or html.
Size of the banner should not exceed 35 kB
Banner design should have pleasant aesthetic look. We do not accept banners with big flashing text or graphical elements and/or background, sharp movement of the elements,which are distracting user from interacting with the webpage.
It is prohibited to use any sound effects in the banner.