var num=0;

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['photogallerypics/01.jpg'],
['photogallerypics/02.jpg'],
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['photogallerypics/16.jpg'],
['photogallerypics/18.jpg'],
['photogallerypics/photogallery01.jpg'],
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['photogallerypics/photogallery04.jpg'],
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['photogallerypics/photogallery15.jpg'],
['photogallerypics/photogallery16.jpg'],
['photogallerypics/photogallery17.jpg'],
['photogallerypics/photogallery18.jpg'],
['photogallerypics/photogallery19.jpg'],
['photogallerypics/photogallery20.jpg'],
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['photogallerypics/07.jpg'],
['photogallerypics/11.jpg'],
['photogallerypics/14.jpg'],
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    ['photogallerypics/rep10.jpg'],
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  ['photogallerypics/formal08.jpg'],
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function slideshow(slide_num) {
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}

function slideshowUp() {
  num++;
  num = num % imgArray.length;
  slideshow(num);
}

function slideshowBack() {
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  if (num < 0) {num=imgArray.length-1;}
  num = num % imgArray.length;
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}