how to find download is completed in php program

In my php program, when user clicks the download link, image(jpg) file will be downloaded.
But i need to add a record to the database after download has completed.
ie., I need to less Credit Points of that particular user after download has completed.
How do i know by the php program whether download is completed.
How can i check this?

i have given update query in download.php.

When i click download link, a dialog box appears, whether to Open, Save or Cancel.

When i click 'Cancel' the database should not be updated.

kindly reply for this.


Thankyou, Hamid

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