// JavaScript Document
   function image() { };  
   image = new image(); 
   number = 0;  
   // imageArray 
   image[number++] = "<img src='images/leftbase.gif' border='0'>" 
   image[number++] = "<img src='images/leftbase1.gif' border='0'>"
   increment = Math.floor(Math.random() * number);  document.write(image[increment]);