/* 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 = [
  ['01.jpg','interference','1/20'],
  ['02.jpg','interference','2/20'],
  ['03.jpg','message','3/20'],
  ['04.jpg','message','4/20'],
  ['05.jpg','interference','5/20'],
  ['06.jpg','interference','6/20'],
  ['07.jpg','message','7/20 '],
  ['08.jpg','information','8/20'],
  ['09.jpg','interference','9/20'],
  ['10.jpg','message','10/20'],
  ['11.jpg','information','11/20'],
  ['12.jpg','interference','12/20'],
  ['13.jpg','interference','13/20'],
  ['14.jpg','interference','14/20'],
  ['15.jpg','message','15/20'],
  ['16.jpg','information','16/20'],
  ['17.jpg','interference','17/20'],
  ['18.jpg','message','18/20'],
  ['19.jpg','information','19/20'],
  ['20.jpg','interference','20/20']
]

function slideshow(slide_num) {
  document.getElementById('wave').src=imgArray[slide_num][0];
  document.getElementById('wave').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);
}