Private message form anywhere

Good morning every body,

I search a method to include the private message form on a node.
I have a node and I would like to permit users to send a private message (with the module Privatemsg), so, I must put the private message form on the node page.

I want the form include on the node page, and not a simple link to /privatemsg/new form page.
If it's possible, I would like to put the title of the node in the subject input form.

Thank you for your help.