backgroundPattern

[hershbp at verizon.net]

Hi ,
How can I know what id# background a certain icon or back groud is ? 
I'm trying to figure out the mac backgroundpattern is what # ?
I did put the backgroundpattern of this stack in the message box it 
came up 210091.
What I want ,
if the platfrom is "MacOS" then set the background to "the mac 
background" else to "nothing".
if I put
if the platform <> "MacOS" then set the background to none , then it is 
some kind of black background on the pc platform.
Thanks