// JavaScript Document
function StringArray (n) {
  this.length = n;
  for (var i =1; i <= n; i++) {
    this[i] = ' '
  }
}

function randomNumber(limit){
  return Math.floor(Math.random()*limit);
}

image = new StringArray(5)
image[0] = '/images/photo1.jpg'
image[1] = '/images/photo2.jpg'
image[2] = '/images/photo3.jpg'
image[3] = '/images/photo4.jpg'
image[4] = '/images/photo5.jpg'

ranNumber = randomNumber(5);

document.write('<img width="620" height="237" src="' +image[ranNumber]+ '" />');