// Set up the image and alt files to be used.
var images = new Array();
var titles = new Array();

images[0] = 'images/ambigram-thumbnails.PNG';
titles[0] = 'Ambigrams';
images[1] = 'images/ambigram-thumbnails1.PNG';
titles[1] = 'Ambigrams';

//How many images are there?
var numImages = images.length;

var preBuffer = new Array()
for (i = 0; i < numImages; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = images[i]
}

//Randomly select an image
var whichImage = Math.round(Math.random()*(numImages-1));

//this function shows the image
function showImage(){
   document.write('<img src="'+images[whichImage]+'" title="'+titles[whichImage]+'" alt="'+titles[whichImage]+'" class="right"/>');
}