What is command line for backgrounds in Gnome2.2?

[Paul Johnson <pauljohn ku edu>]

I have a perl script I use with WindowMaker to change backgrounds every 
20 minutes and it draws backgrounds randomly from a directory structure. 
 Since Gnome-2.2 won't cooperate with WindowMaker, I want to use 
Gnome-2.2's background command to do it.

Can you please tell me what the command should be?

pj
--
Paul E. Johnson                       email: pauljohn ukans edu
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700