function swapPic() {
            if (document.getElementById) {
              var thePicture = document.getElementById("bgSwap");
			  var picPath = "../images/bg/bg" + rnd(1) + ".jpg";
              thePicture.src = picPath;
            }
		}
		  
          function rnd(n) {
            return Math.floor(Math.random() * n) + 1;
          }