Form Personalization - Custom Function - How to pass parameters?

Hi,
My requirement is to call a custom mod pl/sql program (html page) from purchasing when the "approve" button is pressed. I have it working, but don't know how to pass parameters to my function.
I have my function defined and registered. In the definition under "Web HTML" tab, I have my pl/sql procedure call under "HTML Call". Where do the parameters go?
On the customization of form POXPOEPO, I am using Builtin - Launch a function. I want to pass the po_header_id, so under "Parameters", I did "Insert Item Value" of :PO_HEADERS.PO_HEADER_ID
My custom HMTL page is popping up, but the parameter is not being passed. Is there something in the Function Definition where I can define the incoming paramaters?
Thanks.
Paul

Hi paul;
There are many usefull link avaliable if you googling
http://www.google.com.tr/#hl=tr&biw=1259&bih=793&&sa=X&ei=4wxQTZmYEISRswaNktWSDQ&ved=0CC4QBSgA&q=How+to+pass+parameters%2Bform+personalization&spell=1&fp=64d53dfd7a69225a
Regard
Helios

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