Javascript bulk delete all messages at once

HI

i want a script to delete all my message at once, i did it once, dragin a link to the bookmarks, then opening the message page of facebook, and clicking on the tab, and then voila. all gone.

BUt it wont work anymore! maybe cuz facebook updated, i dont know.

Anyone knows how to do it?
Thanks

I have same problem.
I think FB blocked that function.

hmmm, i dont think so.

Anyway, everything is possible with programation