HTTP parameters used to style background color

[Dennis Byrne]

I am using HTTP requests like the following to generate map images. 

http://mydomain.com/fcgi-bin/mapserv?img.y=200.0&img.x=300.0&imgext=-2126099.0%20174206.0%201534483.0%202614595.0&zoom=1&layers=alaska_gen&layers=arimspt&map=%2Fopt%2Fmaps%2Falaska_test.map&

The background for these images defaults to grey.  Can anyone tell me how 
to change this color ... a link to this in the documenation would be 
appreciated as well.

Dennis Byrne
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