<!-- Paste this code into an external JavaScript file named: simpleImageGallery.js  -->

/* This script and many more are available free online at The JavaScript Source :: http://javascript.internet.com Created by: Jay M. Rumsey, OD :: http://www.nova.edu/~rumsey  */

var num=0;

imgArray = [
  ['pics/ppt1.jpg','ppt1','Slide 1'],
  ['pics/ppt2.jpg','ppt2','Slide 2'],
  ['pics/ppt3.jpg','ppt3','Slide 3'],
  ['pics/ppt4.jpg','ppt4','Slide 4'],
  ['pics/ppt5.jpg','ppt5','Slide 5'],
  ['pics/ppt6.jpg','ppt6','Slide 6'],
  ['pics/ppt7.jpg','ppt7','Slide 7'],
  ['pics/ppt8.jpg','ppt8','Slide 8'],
  ['pics/ppt9.jpg','ppt9','Slide 9'],
  ['pics/ppt10.jpg','ppt10','Slide 10'],
  ['pics/ppt11.jpg','ppt11','Slide 11'],
  ['pics/ppt12.jpg','ppt12','Slide 12'],
  ['pics/ppt13.jpg','ppt13','Slide 13'],
  ['pics/ppt14.jpg','ppt14','Slide 14'] ]

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);
}