Just thought i would post up my solution, this works in chrome, i have yet
to cross browser:
var myIFrame = chartDiv.getElementsByTagName('iframe')[0];
var content = myIFrame.contentWindow.document.body;
var rect = content.getElementsByTagName('rect')[2];
rect.setAttribute('fill-opacity', '1');
You should also be able to change the chart area background color with:
rect.setAttribute('fill', '#000000');
Thank you for your help asgallant.
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