This versatile popunder window script allows you to precisely control how often the window pops under, in terms of 'once every x hours'. For example, specifying 24 hours translates into the script popping under only once a day. Furthermore, you can modify this duration at anytime, and the script will reset itself to the new duration (ie: 8 hours instead). Cool.

If you have a new window open up on your home page, it opens every time your visitors come back to that page. This is rude as well as very annoying thing to force onto your visitors. But, using cookies, this JavaScript can determine if the visitor has been here before, and only open a new window on their first visit to the page. The next time they come back, the script will read the cookie, identify them as a repeat visitor, and NOT open the window again. Neat!