function image() { }; 
image = new image();
number = 0; 
// imageArray
image[number++] = "<img src='/home/images/header_banner2.jpg' border='0'>"
image[number++] = "<img src='/home/images/header_banner3.jpg' border='0'>"
increment = Math.floor(Math.random() * number);  document.write(image[increment]);