//image rotation created on April 5, 2006 
 num=backgroundImage.length;
 incr=Math.floor(Math.random()*num);


function backgroundImageRotate()
{
 document.open();
 document.write("<div id='layerMast' style='background-image: url(/arts_tech/images/levelThreeImages/" + backgroundImage[incr] + ");'>");
 document.close();
}