function image() {
};

image = new image();
number = 0;

// imageArray
image[number++] = "<img src='/common/images/banner_01.jpg'>"
image[number++] = "<img src='/common/images/banner_02.jpg'>"
image[number++] = "<img src='/common/images/banner_03.jpg'>"
image[number++] = "<img src='/common/images/banner_04.jpg'>"
image[number++] = "<img src='/common/images/banner_05.jpg'>"

// keep adding items here...

increment = Math.floor(Math.random() * number);