Actually, it can be done in the javascript in the send pm template. There is a check when the submit button is clicked. If the subject is blank, a box pops up. You can add a check right before that line so that if the title is blank, the title is set to "No Subject Entered"
I did it the PHP way as well in both private.php and private2.php, but I am pretty sure the javascript is all that is required.
Amy
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