This script opens a pop-under window that is resizeable, with specific random URL's to pop open, with or without toolbars, menu, etc. Can use cookie to remember if your site's visitor has already seen it once. Just cut and paste into any page.
Developer: mikenew.net Platform: Date upd:2001-10-15 Hits5043 [Visit]

This script will open a 'pop up window' that pop up blocker programs can't stop.
Developer: digi-dl.com Platform: Win Date upd:2004-09-29 Hits2803 [Visit]

Use this practical DHTML script to not only open up links in a secondary popup window, but one that's centered in the middle of the user's screen. Browsers other than NS 4+ or IE 4+ will still open the window, only that it won't
Developer: dynamicdrive.com Platform: Date upd:2000-05-24 Hits9208 [Visit]

This versatile popunder window script allows you to precisely control how often the window pops under, in terms of "once every x hours".
Developer: javascriptkit.com Platform: all Date upd:2004-07-27 Hits768 [Visit]

This script opens a customizable (popup) window in the center of the screen of your visitor. Useful to draw the attention from the viewers.
Developer: creation-de-site.net Platform: Date upd:2001-11-05 Hits7216 [Visit]