Call jQuery and jQuery Lazy Load plugin
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="jquery.lazyload.min.js"></script>
Call plugin function.
<script>
$(function() {
$('img.lazy-load').lazyLoad();
});
</script>
Use data-src to your images
<img src="replace.png" data-src="http://andafter.org/media/blogs/eucompraria/shop/images/products/cortador-papel/cortador-papel4.jpg" class="lazy-load" />