var num=0;

imgArray = [
  ['images/Investigations/Invest20090925_01.JPG','Light Anomaly','1/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_02.JPG','Light Anomaly','2/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_03.JPG','Multiple Light Anomalies','3/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_04.JPG','Multiple Light Anomalies','4/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_05.JPG','Light Anomaly','5/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_06.JPG','Multiple Light Anomalies','6/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_07.JPG','Multiple Light Anomalies','7/22 - /Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_08.JPG','Light Anomaly','8/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_09.JPG','Multiple Light Anomalies','9/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_10.JPG','Multiple Light Anomalies','10/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_11.JPG','Multiple Light Anomalies','11/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_12.JPG','Light Anomaly','12/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_13.JPG','Light Anomaly','13/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_14.JPG','Multiple Light Anomalies','14/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_15.JPG','Multiple Light Anomalies','15/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_16.JPG','Light Anomaly','16/22 - Light Anomaly'],
  ['images/Investigations/Invest20090925_17.JPG','Multiple Light Anomalies','17/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_18.JPG','Multiple Light Anomalies','18/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_19.JPG','Light Anomaly With Smoke','19/22 - Light Anomaly With Smoke'],
  ['images/Investigations/Invest20090925_20.JPG','Multiple Light Anomalies','20/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_21.JPG','Multiple Light Anomalies','21/22 - Multiple Light Anomalies'],
  ['images/Investigations/Invest20090925_22.JPG','Light Anomaly','22/22 - Light Anomaly']
]

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);
}