If you're up to a challenge, I'll fill in the particulars for you.
My test file is at http://www.foothillexpress.com/search-test.html
What I would like to do is integrate searches for two separate features of my website into one elegant little search form having one text input field and two submit buttons.
The one, Coppermine Photo Gallery, which I want to use for photos on my site, needs "search" as its text input parameter. The other, Fluid Dynamics Search Engine, which I am using for articles on my site, uses "Terms." What I needed was some way to dynamically change the input name depending on which search they wanted to do, just like I've solved the issue of dynamically assigning the action.
That's where your CopyFieldValue comes in. I was hoping to have two text input fields, one named "Terms," the other named "search." But one of them would be hidden, and have its value supplied by your CopyFieldValue action. If I have both text fields visible, the action works perfectly. But, if I hide the other field so the user doesn't see it, the value doesn't get passed.
One hitch, assuming I can get that part of it figured out, is that I also want to hide the link that calls the action and either integrate it with the alternate button, or have it automatically fill the other field as the search text is typed in.
Personally, I enjoy these challenges because I can learn so much from them. But, I would understand if you wouldn't wish to make the challenge your own. If you would like to play with the file a bit, however, do the two searches as it stands now. Then download it, unhide the other text input field, and then do the searches. You'll see what I mean. Since I don't have much content on my site yet, you can use the words "snow" or "Debbie" or "Thornton" as search examples.
The worse that can happen is I'll have a separate text field for searching articles and photos, and two separate submit buttons. It's just not as elegant as I would like, that's all.