This JavaScript demonstrates how to create a popup window that moves around the screen. It gets (de)activated upon moving cursor over a given link.
Developer: js-examples.com Platform: Date upd:2001-03-12 Hits4232 [Visit]

The Referring URL Probe can help keep visitors on your web site longer, especially if you have reached a targeted visitor. How is this possible? The Referring URL Probe control determines if a visitor has accessed one of your web pages directly, or through
Developer: geocities.com Platform: IE5 and 6x Date upd:2004-07-14 Hits1674 [Download] [Visit]

This JavaScript code will automatically center new browser window/popup windows on the screen. You can specify the size of the new window. Very easy to use: just copy and paste and that's it.
Developer: commondrops.com Platform: All Platform Date upd:2006-01-22 Hits146044 [Download] [Visit]

This script uses DHTML to display a "popup" window. Features include timed delay before displaying, drop shadowing, and many customizable variables. Easy to follow, heavily commented JavaScript. Avoid having your popup window blocked by unforgiving popup blockers.
Developer: Spider WebMaster Tools.com Platform: linux, windows, freebsd, sun Date upd:2006-12-13 Hits6066 [Visit]

This JavaScript allows visitors to open a customized window. The configurable parameters include: Toolbar, Location, Directories, Status, Menubar, Scrollbars, Resizable, Width, and Height.
Developer: javascript.internet.com Platform: Date upd:2000-01-24 Hits15116 [Visit]