Concatenating into a single text field multiple choices from a dialog window

Question

I present a user with a form which contans a list from where to chose a few items.
I need to take what he puts in there, and convert it into a string to pass it to a query... They click to select, and click to deselect, and I have to show in the underlying form's parameter list the items he has chosen in this form:
joe,frank,rizzo
if he clicks again on rizzo, the list (and he can see it) would show:
joe,frank
Thats the first part. Now, I have to pass three or more of these strings to a library procedure to do 'recheck' or validation, against the same tables, etc,). I don't want to put the loop in the library... but if I have to, I can only bring a single variable text string into it. Which means, I have to move each of the various strings of choices into the variable which goes to the library procedure.
Complex enough?
I have about three days to figure it out.
Summary: 1. Concatenating the choices.
2. sending different values into the library procedure, using the same variable in the library procedure.
Thanks in advance!
Nick
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Answer 1

Try something like:
// Get field values
var first_name = getField("FirstName").value;
var middle_name = getField("MiddleName").value;
var last_name = getField("LastName").value;
// Build full_name string
var full_name = "Mr. " + last_name + ", " + first_name + middle_name;
// Set this field's value equal to full_name
event.value = full_name;
This is intended to be the custom calculation script fot the "FullName" field.
Refinements might be to have the user specify the title (Mr, Mrs, Dr., etc.) and handle missing values properly, but this should get you started.
If you will be doing much scripting, you should get the Acrobat JavaScript Reference.
George