Hang on while I add some debugging functions to the script so I can see what is going wrong.
Edit: Attached file. Install it then go into messenger plus options, then scripts then click show debugging. If it is already ticked and there is no debugging window, go to the Plus! menu in the Main messenger window and click "Show debugging". Then once the window has opened click the combo box then select the poke script. It should say something along the lines of "yourname says: poke"
Repeat it here and i'll do my best to help.
Cloudy