var num=0;

imgArray = [
  ['images/SeacroftB_small.JPG','inn', ''],
  ['images/SeacroftN_small.JPG','walk',''],
  ['images/PergolaC_small.JPG','pergola',''],
  ['images/SeacroftH_small.JPG','se',''],
  ['images/SeacroftL_small.JPG','street',''],
  ['images/SeacroftM_small.JPG','sw',''],
  ['images/IMG_0407_small.JPG','flowerse',''],
  ['images/IMG_0410_small.JPG','flowersc',''],
  ['images/DeckC_small.JPG','Deck','']
]

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);
}