title: Lazy load and unload of images
body: <p>I have an html file with many  tags.</p>
  
  <p>I want to load images on scroll event, and unload the images which are not visible.
  like in Aamzaon viewer, when you scroll up/down, the current image in the frame is lazy loaded.</p>
  
  <p>I saw a lot of LazyLoad tools, but no one of them has unload functionallity.</p>