Sorry for that:

When I hover over the image of the buttons I can see the code that it executes in the bottom Left corner, just like IE, but when I press the buttons nothing happens.

In IE7, and 8 the new window appears and more info is input......however in FF I see the code that begins

Code:
javascript:popupWindow('http://localhost/zencart/admin/super_payments.php?.......etc
but no popup or new window ever appears.

IE is fine for me at the min, but I am in the process of moving to Ubuntu, this is one of the things I need fixed, so 'er indoors' can keep working. LOL