Does anyone know how to get the current iteration of the collection you are in?  Here is the scenario I am trying to accomplish:

I have a form where a user puts in their number, and a lookup rule fills in a collection with however many contracts they have.  The collection is configured to "append sets to the sets populated by a data source or variable.  The procedure works great and I am getting back the data I need.  

However, I want one of the items in the collection to be a Custom HTML activity.  This HTML activity is a hyperlink that the user can click on that will launch WebAccess and run a search for a parameter within its own collection.  I have this working fine on other forms but there is no collection, it is just one HTML link referencing one field on the Form.

Current syntax:   <a class="links" id="a2" onclick="window.open(href='http://server/laserfiche/Browse.aspx?repo=Dev#?search={[Contracts]:[Contract ID]%3D'+document.getElementById('Field13').value+'}%26{LF:Name%3D*, Type%3DF}%26%7BLF%3ALOOKIN%3D%22LegalWF%5C~In%20Process%5CContracts%22%7D'); return false">CLICK TO VIEW DOCUMENTS</a>

Again, this works on a normal field.  However in this case Field13 is in a collection.  So the first one is going to be Field13(0), second is Field 13(1), and so on.  

So what I need is for it to be %3D'+document.getElementById('Field13(X)').value

where X is the current iteration of the collection.

Hopefully that makes sense, does anyone know if that's possible or how I get that current collection number?

Thanks,

Chris