function image() {
};
image = new image();
number = 0;
// imageArray
image[number++] = "<img src='http://w2.byuh.edu/alumni/images/students/students1.gif' border='0'>"
image[number++] = "<img src='http://w2.byuh.edu/alumni/students/students2.gif' border='0'>"
// keep adding items here...
increment = Math.floor(Math.random() * number);
document.write(image[increment]);