Custom popup from tabular form

Hi,
I would like to create a custom popup in a tabular form.
The standard popup doesn't realy satisfy my needs.
I followed the "How to" to create a custom popup, so that method is known. And this is working for a part.
I managed to alter the tabular form so that it calls the Javascript to get the popup window by entering :
<INPUT TYPE="TEXT" VALUE="#PROJ_ID#"> Click for LOV
in the HTML Expression of the column format section.
So the popup window is opened correctly, but the problem is how to return the selected value to the text item in the tabular form.
Returning a value to a normal text item is no problem, but it is to return it to a cell in an tabular form.
I tried to enter the following in the Passback Javascript:
opener.document.getElementById("F04").value = passVal2;
But this doesn't work correct and also is not flexible since F04 is the cell for only that row.
So the question is: How can I write my Javascripts Passback function so that it returns the passVal2 value to the right cell of the tabular form?
Any ideas?
Regards Guido

Nobody has ever done such thing?
Isn't there a way to address a specific cell in a tabular form?
Maybe then I have to look for another solution:
What I would like is, when selecting something from the popup (in the tabular form) a second column (The description column)has to be filled in with a value looked up from the selected popup value. This is just a default value,this "Description" field must be a text field so that users can change the description before "saving" the record to the table.
So anybody has an idea how this can be implemented?
Thanks for your help in advance!
Guido

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