New: Can now be applied to other HTML elements besides links. Furthermore, in addition to only taking the 'href' attribute of a current link, it is now possible to specify the URL to display. As such the extension can now be used more generally to create popup windows.
Want to know what has changed in the latest version? See the list of fixes and enhancements.
Access this behavior:
step 1 - select the popup trigger, and
step 2 - choose 'Popup Link' from the 'FlevOOware' flyout in the Behaviors palette.