var photo = new Array()
var photoNum = 0

photo[0] ="images/market-choice/1.jpg"
photo[1] ="images/market-choice/2.jpg"
photo[2] ="images/market-choice/3.jpg"
photo[3] ="images/market-choice/4.jpg"
photo[4] ="images/market-choice/5.jpg"
photo[5] ="images/market-choice/6.jpg"
photo[6] ="images/market-choice/7.jpg"
photo[7] ="images/market-choice/8.jpg"
photo[8] ="images/market-choice/9.jpg"
photo[9] ="images/market-choice/10.jpg"

function forward() {
  if (photoNum < photo.length - 1) {
    photoNum = photoNum + 1;
    document.images.gallery.src=photo[photoNum];
  }
  else {
    photoNum = 0;
    document.images.gallery.src=photo[photoNum];
  }
  imageNum();
}

function backward() {
  if (photoNum > 0) {
    photoNum = photoNum - 1;
    document.images.gallery.src=photo[photoNum];
  }
  else {
    photoNum = photo.length - 1;
    document.images.gallery.src=photo[photoNum];
  }
  imageNum();
}

function imageNum() {
  var imagediv = document.getElementById("position-string");
  imagediv.innerHTML = (photoNum + 1) + " of " + photo.length;
}