var num=0;

imgArray = [
  ['gallery/Photo1.jpg','information', ''],
  ['gallery/Photo2.jpg','information', ''],
['gallery/Photo3.jpg','information', ''],
['gallery/Photo4.jpg','information', ''],
['gallery/Photo5.jpg','information', ''],
['gallery/Photo6.jpg','information', ''],
['gallery/Photo7.jpg','information', ''],
['gallery/Photo8.jpg','information', ''],
['gallery/Photo9.jpg','information', ''],
['gallery/Photo10.jpg','information', ''],
['gallery/Photo11.jpg','information', ''],
['gallery/Photo12.jpg','information', ''],
['gallery/Photo13.jpg','information', ''],
['gallery/Photo14.jpg','information', ''],
['gallery/Photo15.jpg','information', ''],
['gallery/Photo16.jpg','information', ''],


]

function slideshow(slide_num) {
  document.getElementById('mypic').src=imgArray[slide_num][0];
  document.getElementById('mypic').alt=imgArray[slide_num][1];
  document.getElementById('burns').innerHTML=imgArray[slide_num][2];
}

function slideshowUp() {
  num++;
  num = num % imgArray.length;
  slideshow(num);
}

function slideshowBack() {
  num--;
  if (num < 0) {num=imgArray.length-1;}
  num = num % imgArray.length;
  slideshow(num);
}