TOPIC:

Thats why I asked on what "action" you would like to fill the hidden input? On submit I guess?
If yes, then you could put that into the ff_validate_submit function (see "Scripts" library and that validation's details)

When I enter this code into begin submit:
I get this error:

remove that first line that says

$this->execPieceByName('ff_InitLib');

It is for pieces, not scripts.

I tried that still the same error. That is when I added that line hoping it would help. where should I be placing the code? right now it is under submit pieces>>begin submit.

thats wrong, it should go into Scripts "initialization script" since it is javascript. Pieces are php only.

Then you can use that in your custom validations etc.

I'm not sure I fully understand. I put the js code in advanced options>scripts>initialization scripts but then also in custom validations?

I have tried putting it in both places as well as each separately. I am no longer getting an error it just doesn't do anything. I also tried placing it within the PayPalSelect intscript that did not work nor did the values of my summary fields display.

I appreciate all of your help with this. I hope we can get this working.