function RandomPicture() {
// EDIT THIS:
var NUMBER_OF_PICTURES = 8;
var BASE_URL = 'http://www.jeanweber.com/pix_of_me/jean-';
var EXT = 'jpg';

// Don't edit this:
var num = Math.ceil(NUMBER_OF_PICTURES*Math.random());
document.write('<img src="' + BASE_URL + num + '.' + EXT + '"/>');
}