var photo = new Array()
var photoNum = 0

photo[0] ="images/tate/1.jpg"
photo[1] ="images/tate/2.jpg"
photo[2] ="images/tate/3.jpg"
photo[3] ="images/tate/4.jpg"
photo[4] ="images/tate/5.jpg"
photo[5] ="images/tate/6.jpg"
photo[6] ="images/tate/7.jpg"
photo[7] ="images/tate/8.jpg"
photo[8] ="images/tate/9.jpg"
photo[9] ="images/tate/10.jpg"
photo[10] ="images/tate/11.jpg"
photo[11] ="images/tate/12.jpg"
photo[12] ="images/tate/13.jpg"
photo[13] ="images/tate/14.jpg"
photo[14] ="images/tate/15.jpg"
photo[15] ="images/tate/16.jpg"
photo[16] ="images/tate/17.jpg"
photo[17] ="images/tate/18.jpg"
photo[18] ="images/tate/19.jpg"
photo[19] ="images/tate/20.jpg"
photo[20] ="images/tate/21.jpg"
photo[21] ="images/tate/22.jpg"
photo[22] ="images/tate/23.jpg"
photo[23] ="images/tate/24.jpg"
photo[24] ="images/tate/25.jpg"
photo[25] ="images/tate/26.jpg"
photo[26] ="images/tate/27.jpg"
photo[27] ="images/tate/28.jpg"
photo[28] ="images/tate/29.jpg"
photo[29] ="images/tate/30.jpg"
photo[30] ="images/tate/31.jpg"
photo[31] ="images/tate/32.jpg"
photo[32] ="images/tate/33.jpg"
photo[33] ="images/tate/34.jpg"
photo[34] ="images/tate/35.jpg"
photo[35] ="images/tate/36.jpg"
photo[36] ="images/tate/37.jpg"
photo[37] ="images/tate/38.jpg"
photo[38] ="images/tate/39.jpg"
photo[39] ="images/tate/40.jpg"
photo[40] ="images/tate/41.jpg"
photo[41] ="images/tate/42.jpg"
photo[42] ="images/tate/43.jpg"
photo[43] ="images/tate/44.jpg"
photo[44] ="images/tate/45.jpg"
photo[45] ="images/tate/46.jpg"
photo[46] ="images/tate/47.jpg"
photo[47] ="images/tate/48.jpg"
photo[48] ="images/tate/49.jpg"
photo[49] ="images/tate/50.jpg"
photo[50] ="images/tate/51.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;
}