[Alan_SP]

Excellent idea, I too was missing original PM quoted.

But I did it much simpler (using your code, of course) template edit:

Find Private Message Templates->pm_quickreply.

Here find this code:

<div class="editor_textbox quickreply">
			<textarea name="message" id="{vb:raw editorid}_textarea" rows="10" cols="80" tabindex="1" dir="{vb:stylevar textdirection}"></textarea>
		</div>

and make it to look like this:

<div class="editor_textbox quickreply">
			<textarea name="message" id="{vb:raw editorid}_textarea" rows="10" cols="80" tabindex="1" dir="{vb:stylevar textdirection}">{vb:raw newpost.message}</textarea>
		</div>

Only difference is adding {vb:raw newpost.message} in appropriate position. Of course, for many installing mod and not making template edit is easier to do.