Download link with parameters.

I've created a generic download function that takes a couple of parameters. The function works but now I'm trying to find out how to provide a download link that has the parameters filled in based on some page items.
Page items:
P38_export_type: The user can select what kind of data to download
P38_filename: The user can provide a filename
What I've tried is to create a button: Redirect to URL
#OWNER#.download_my_file?p_application_id=&APP_ID.&p_filenaam=&P38_FILENAME.&p_functie=Statistiek&p_parameter1=&P38_EXPORT_TYPE.
Although this creates a link, the parameters are filled on page load. This is to early, I need the values at the time the button is pressed.
Any ideas how to do this?

Hi thanks,
In the meantime I figured out something similar.
function my_redirect ()
redirect(html_GetElement('P38_OWNER').value+".download_my_file?p_application_id="+html_GetElement('pFlowId').value+"&p_filenaam="+html_GetElement('P38_BESTAND').value+"&p_functie=Statistiek&p_parameter1="+html_GetElement('P38_SOORT_EXPORT').value);
} I struggled a bit with the owner value before I decided to put it in a hidden field. Passing it as a variable is a better idea.
It seems that accessing the item values can be done in several ways.
redirect or location.href=URL ? any preference?

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I do a research and know that get_blob_file_source link to the source of the column / field name located in the first parameter.
So I had put the UPLOADED_FILE column, DOCUMENT table in the source of the column PN.
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I urgently need to do this report.
The version of APEX we use is Application Express 4.0.2.00.07
And I cannot ask for an upgrade to 4.2 till the end of next year.
Please help.
Thanks a lot in advance.
Ann.

Hi Ann,
Here you can see and download the example :
http://apex.oracle.com/pls/apex/f?p=63066:1
Please let me know if you need access the work space.
Hint, Please read the FAQ section. had you put your thread in a better format, you would have gotten a quicker response :)
Regards,
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