Simple jQuery Image Preload Extension

jquery_image_preload.js

/**
 * Simple jQuery Image Preloader Extension
 * 
 * @param images = array source images to preload
 * @param callback = optional function to execute when loaded
 */
$.fn.imagePreloader = function (images, callback) {
    var deferreds = [];
    $.each(images, function(i, src) {
        deferreds.push(new $.Deferred(function (dfd) {
            var image = new Image();
            image.onload = function () {
                dfd.resolve(image);
            };
            image.onerror = function () {
                 dfd.resolve();
            }; 
            image.src = src;
        }).promise());
    });
    $.when.apply($, deferreds).then(function() {
        if (callback) {
            callback();
        }
        $(this).trigger('images_loaded');     
    });
}