Mass deletion of FB messages - plugin/script

I need a plugin/script that will delete all messages sent by my account in all conversations on FB (i.e. instead of going into each conversation individually and clicking "undo send", the plugin/script will do it for me). Optionally, it would be good if the plugin also had time limitation (i.e. delete only from - to or delete only from conversations with XX users, where XX is the profile/user ID from FB).

Please provide me with price quotes along with a description of the proposed operation of the plugin/script.