var num=0;

imgArray = [
  ['../images/car-safety/car-seat-safety.jpg','photo',''],
  ['../images/car-safety/car-seat-safety2.jpg','photo',''],
  ['../images/car-safety/car-seat-safety3.jpg','photo', ''],
  ['../images/car-safety/car-seat-safety4.jpg','photo', ''],
  ['../images/car-safety/car-seat-safety5.jpg','photo', '']
]

function slideshow(slide_num) {
  document.getElementById('mypic2').src=imgArray[slide_num][0];
  document.getElementById('mypic2').alt=imgArray[slide_num][1];
  document.getElementById('burns2').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);
}