function imageSwapper() {
	var img_name = new Array("images/rotate/business.jpg", "images/rotate/business1.jpg", "images/rotate/business3.jpg", "images/rotate/business2.jpg");

	var l = img_name.length;

	var rnd_no = Math.round((l-1)*Math.random());

	document.r_img.src = img_name[rnd_no];
}