var num3=0;

imgArray3 = [
  ['http://movermoms.org/programs/bookclub/previous/book3/photo_01.jpg','photo 1 mouseover text'],
  ['http://movermoms.org/programs/bookclub/previous/book3/photo_02.jpg','photo 2 mouseover text'],
  ['http://movermoms.org/programs/bookclub/previous/book3/photo_03.jpg','photo 3 mouseover text'],
  ['http://movermoms.org/programs/bookclub/previous/book3/photo_04.jpg','photo 4 mouseover text'],
  ['http://movermoms.org/programs/bookclub/previous/book3/photo_05.jpg','photo 5 mouseover text']
  ]

function slideshow3(slide_num) {
  document.getElementById('mypic3').src=imgArray3[slide_num][0];
  document.getElementById('mypic3').alt=imgArray3[slide_num][1];
}

function slideshow3Up() {
  num3++;
  num3 = num3 % imgArray3.length;
  slideshow3(num3);
}

function slideshow3Back() {
  num3--;
  if (num3 < 0) {num3=imgArray3.length-1;}
  num3 = num3 % imgArray3.length;
  slideshow3(num3);
}