var backColor = new Array(); 
backColor[0] = '#FFFFFF';
backColor[1] = '#FFFF00';
backColor[2] = '#66CC00';
backColor[3] = '#339900';
backColor[4] = '#00CCFF';
backColor[5] = '#0066CC';
backColor[6] = '#FF99CC';
backColor[7] = '#FFCC00';
backColor[8] = '#CC33FF';

function changeBG(whichColor){
document.bgColor = backColor[whichColor];
setColourCookie(backColor[whichColor]);
}