changing xdm settings

[ctrlER <ctrler@zmail.pt>]

Hi, how are you?

I would like to change xdm default background (the one that apears when 
the login information is prompted) to solid black.
Does anybody what file I have to edit to change that?

I was thinking of something along the line of

	xsetroot -solid black

but I dont know where to put it.

Thank You.

Ricardo

(Portugal)