jQuery Deferred Image Preloader

gistfile1.rb

var images = [
    "pins/bluePin.png",
    "pins/greenPin.png",
    "pins/orangePin.png",
    "pins/pinkPin.png",
    "pins/purplePin.png",
    "pins/yellowPin.png"
];

var preloadImages = function() {
    var output = [];
    for(var i = 0; i < images.length; i++) {
        var deferred = $.Deferred();
        var imgObj = new Image();
        imgObj.src = "image_path/" + images[i];
        imgObj.onload = deferred.resolve;
        output.push(deferred.promise());
    }
    return output;
};

$.when.apply($, preloadImages());