function image()
{
};
image = new image();
number = 0;
image[number++] = "<img src='http://epsomhospitalradio.andrewtijou.co.uk/images/pagepics/1.jpg' border='0'>"
image[number++] = "<img src='http://epsomhospitalradio.andrewtijou.co.uk/images/pagepics/2.jpg' border='0'>"

increment = Math.floor(Math.random() * number);
document.write(image[increment]);