<div id="slider">
    <img src="images/slide1.jpg" alt="" />
    <a href="http://dev7studios.com"><img src="images/slide2.jpg" alt="" title="#htmlcaption" /></a>
    <img src="images/slide3.jpg" alt="" title="This is an example of a caption" />
    <img src="images/slide4.jpg" alt="" />
</div>

$(function(){
    $.each(document.images, function(){
               var this_image = this;
               var src = $(this_image).attr('src') || '' ;
               if(!src.length > 0){
                   //this_image.src = options.loading; // show loading
                   var lsrc = $(this_image).attr('lsrc') || '' ;
                   if(lsrc.length > 0){
                       var img = new Image();
                       img.src = lsrc;
                       $(img).load(function() {
                           this_image.src = this.src;
                       });
                   }
               }
           });
  });

<div id="slider">
</div>

jQuery(function(){
    $("#slider").append('<img src="images/slide1.jpg" alt="" />');
});

$(window).load(function () {
  // run code
});

var image = new Image();
image.src = "/path/to/huge/file.jpg";

image.onload = function() {
  ...
}

<img class="b-lazy"
     src="placeholder-image.jpg"
     data-src="image.jpg"
     data-src-small="small-image.jpg"
     alt="Image description" />

var bLazy = new Blazy({
        breakpoints: [{
        width: 420 // Max-width
          , src: 'data-src-small'
    }]
      , success: function(element){
        setTimeout(function(){
        // We want to remove the loader gif now.
        // First we find the parent container
        // then we remove the "loading" class which holds the loader image
        var parent = element.parentNode;
        parent.className = parent.className.replace(/bloadingb/,'');
        }, 200);
        }
   });

<script type="text/javascript">
jQuery(function(){

//your function implementation here...

});
</script>