Interstitial ads (interstitial means "in between") are a way of placing full page messages between our publisher's current and destination page. You can place an image ad (Max Width 800 Pix, Height 600 Pix) or a Header and Text ad. 

Publishers are advised to place Interstitial ads on their 'log in pages', so when their members log in, they will be taken to your full page ad. If the visitor is interested in your offer, they can click on your ad (opens a new window) and take advantage of your offer. If they are not interested, they can click "Skip This Ad" link and continue to the destination page.