change Call for Price link

I've spent a little bit of time searching this in the forums but I didn't see what I was looking for. I have a feeling this is staring me in the face and I may even have edited this previously but can't find it again. Is there a way to change the link that appears in place of the add to cart button for a "call for price" product? My client's store shows a link that goes to the contact form in ZenCart but he has another form (outside of ZenCart) that he wants to use for this.

I was pretty sure I had edited this for him a few years back but perhaps in upgrading his store it was a mod that I overlooked and so it got rewritten back to the default behavior.

Of course the minute I posted this, there showed up at the bottom links to forum threads that were similar to my question! :P And I found the solution. I had modified functions_general.php a while back but missed that when I upgraded. Luckily, I made a copy of the old ZC directory so I can just copy my mod from the old file. Yea!