Fill Private Message fields via Query String? Or send PM outside of VB

[wdwms]

Greetings,
We have an external system that our users use to track models in their collection. We used to be able to allow users contact other members by using the sendmessage.php file with some query string parameters.

With 3.5 that broke so we are trying to use the PM feature..
I can get it to fill in the destination userID but i can't get it to fill in the subject and message...

I've tried:

http://servername/vb/private.php?do=newpm&userid=2274&title=test&message=test

http://servername/vb/private.php?do=newpm&userid=2274&subect=test

etc.. you get the point.. any idea on what the query string needs to look like or if this is possible? If not possible, how can I send a PM relatively easy from outside VB?

Thanks!

-t