Load optimisation

utility.js

/*
  Author: Qawelesizwe Mlilo
  Email: qawemlilo@gmail.com
  Notes: This script is for optimising loading speed for pages with many images. 
*/


// Mootools
window.addEvent('domready', function () {      
    $$("img").each(function (image) {
        var currentImage = image, og_src = currentImage.src ;
        
         if (!currentImage.complete) currentImage.src = "images/place_holder.gif";
        
        window.addEvent('load', function() {
            currentImage.src = og_src;
        });   
    }); 
});

// JQuery
$(function () { 
    $("img").each(function () {
        var currentImage = this, og_src = currentImage.src ;
		 
        if (!currentImage.complete) currentImage.src = "place_holder.gif";
        
        $(window).load(function () {
            currentImage.src = og_src;
        });   
    }); 
});