Question: I have your advance cross-sell mod installed. What does the "add product field" button in the New Cross Sells section do? It gives the following JS error when I click it:

Line: 25
Char: 2
Error: Object Expected
Code: 0
www....com/admin/xsell_advanced.php

Answer: This happens when your shop is located at the subfolder, for example: yoursite.com/shop
fix:
Is the js folder located at shop/ now? if yes please move it to the root folder (above shop).

Reason: The link to js file is hard-coded and assumes your shop files are located at root. Will try to fix this in the next version.

Regards.