title: how to change images with timer
body: <p>Hi all
  I have to images say image1 and image2
  I want to display both images on timer, only one image should be visible at a time. Both images are overlapped, meaning, image1 is over image2.</p>
  
  <p>So, if I use timer, I want to be able to show one image at a time.
  How do I do this.
  I hope I am clear with my problem</p>