How to set a banner slideshow to run if images are only fully loaded I am new to Drupal, and not that good in Jquery. I just created a Drupal animated banner in Jquery. Each banner image is kinda large about 500kb each jpeg. My problem is, the banner images starts to run even the banner images are not yet fully loaded. Heres the code:

(function ($) {
  // Original JavaScript code.
var currentBackground = 0;
var backgrounds = [];
backgrounds[0] = 'http://www.site.com/sites/all/themes/layoutph/images/bg01.jpg';
backgrounds[1] = 'http://www.site.com/sites/all/themes/layoutph/images/bg02.jpg';
backgrounds[2] = 'http://www.site.com/sites/all/themes/layoutph/images/bg03.jpg';
backgrounds[3] = 'http://www.site.com/sites/all/themes/layoutph/images/bg04.jpg';

var customtitle = [];
customtitle[0] = "Welcome to Site";
customtitle[1] = "Site joined force with Site Foundation";
customtitle[2] = "Site Foundation school campaigns for 2014";
customtitle[3] = "New York visited by Site Foundation";


function changeBackground() {
    if(currentBackground &gt; 3 ) currentBackground = 0;
    currentBackground++;
    $('.masterbg').fadeOut(1000,function() {
         $('div.slogan').text( customtitle[currentBackground] );
        $('.masterbg').css({
            'background-image' : "url('" + backgrounds[currentBackground] + "')"
        });
        $('.masterbg').fadeIn(1000);
    });
    setTimeout(changeBackground, 4000);

}
     setTimeout(changeBackground, 4000);

})(jQuery);


Can you give me a modification to my code, or theres a function I need to add my code to let the banner images load first before banner slideshow start.

Thank you in advance. 

Note: This jquery code is for Drupal.
You can visit this post  Slideshow Tutorial to create slide show On drupal site in Drupal standard way. Try to use Drupal standards.