http://forums.otterhub.org/viewtopic.php?f=60&t=17033

Implementation to retrieve external data and populate options for a Drop Down (Select) list 
1) create a .pl file (provided) though you will need to specify what, exactly, you seek, and where it is.
2) jquery script where you want the options list to post (provided), though you may need to include jquery on the appropriate page.

This implementation:
Thanks! 

Hope it helps someone!