function toggleMenu(n) {
  id = "mb"+n;
  img = document.getElementById(id);
  cursrc = img.src;
  if (cursrc.indexOf("-on.png") == -1) {
    newsrc = cursrc.replace(".png", "-on.png");
    img.src = newsrc;
  } else {
    newsrc = cursrc.replace("-on.png", ".png");
    img.src = newsrc;
  }
}

function processSlideshow(elem, imageList, imageDuration, fadeSpeed, current) 
{
	var listSize = imageList.length;
  if (!current || current >= listSize) current = 0;
  if (!imageDuration) imageDuration = 2000;
  if (!fadeSpeed) fadeSpeed = 1000;
  $(elem + " img").attr("src", imageList[current]);
  if (current == (listSize - 1)) { $(elem).css("background", "transparent url(" + imageList[0] + ") no-repeat");
  } else {
      $(elem).css("background", "transparent url(" + imageList[current + 1] + ") no-repeat");
  }
  $(elem + " img").animate({ opacity: "1" }, imageDuration).
      animate({ opacity: "0.01" }, fadeSpeed, function() 
     { 
       $(this).css("opacity", "1"); processSlideshow(elem, imageList, imageDuration, fadeSpeed, current + 1) 
    });

}