function image()  {

    var number = 0;

    // imageArray
    image[number++] = "<img src='images/BackgroundImages/1.jpg'/>"
    image[number++] = "<img src='images/BackgroundImages/2.jpg'/>"
    image[number++] = "<img src='images/BackgroundImages/3.jpg'/>"
    image[number++] = "<img src='images/BackgroundImages/4.jpg'/>"

    var increment = Math.floor(Math.random() * number);
    return increment;
}