Well I'm not sure I'm any help at all. Your host should be able to assist with something like this easy enough, if they made it though.
No clue who makes that gallery, it does have code in it from dynamicdrivedotcom and this small bit that gives us a hint; (InstanceBegin template="/Templates/default5.dwt") assuming URL="http://www.fileinfo.com/extension/dwt"].dwt[/URL] means dreamweaver template.
Adobe - Dreamweaver Developer Center
The gallery already has alt tags in place. On the main page there are alt texts, but it's just pulling the image name. When you click an image for popup the alt tag is there still, but empty. So, when they say this:
Quote:
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I am told by Heritage there is no way to put ALT Attributes on my images.
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someone's not giving it to you straight.
IMO, if they can have it call an image name for the alt text on the main page, they could at least, add the same code to the popup page to pull the image name in the alt tag there as well.
Anyway, had a few minutes to kill. Sorry can't help more than that
This isn't a cPanel issue though, you'd need to speak to your gallery coder or host about this for help. Or, find a more robust gallery to use from somewhere else that you'll have full control over.