images = new Array(4); // Total number of background images in this value
images[0] = "<style type='text/css'>body { background-image: url('/images/BkgdImgs/FacShow08.jpg')!important; }</style>";
images[1] = "<style type='text/css'>body { background-image: url('/images/BkgdImgs/Foster.jpg')!important; }</style>";
images[2] = "<style type='text/css'>body { background-image: url('/images/BkgdImgs/IDAtriumWall.jpg')!important; }</style>";
images[3] = "<style type='text/css'>body { background-image: url('/images/BkgdImgs/IDLightTable.jpg')!important; }</style>";



index = Math.floor(Math.random() * images.length);

document.write(images[index]);