Retrieving data to parent window

[Corobori]

I would like to retrieve some data from a list of possible alternatives. I tried a few alternatives but can't find the way to make an hyperlink which would send back the information.
This is the form.
When the user enter a string and click "Buscar" a window pops up and display a list of entries. I would like to use a link to retrieve the ID and feed the input box

[mniessen]

I think it can be done only with Javascript (someone correct me if I'm wrong), but I don't know how. If you post in the javascript forum, I'm sure they'll give you a solution very quickly.

Regards,

Michaël