Hmmm... I guess another approach might be to do this with JavaScript. You could have JavaScript that loads when the screen is displayed that changes the background.... and then you could change it back when the screen is submitted back to the RPG program. Would that work for you?
This is off the top of my head, I didn't try it... but you'd do this:
In the screens 'onload' event, run this code:
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document.body.style.backgroundColor="#00FF00";
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document.body.style.backgroundColor="";