simple image preloading

imagePreload.js

var preloadImages = function(images, callback) {
    var current         = 0,
        imageEvtHandler = function() {
            if (current++ === images.length && typeof callback === "function")
                callback.call(this);
        };

    if (images.length > 0) {
        for (var i = images.length - 1; 0 <= i; i--) {
            var img = new Image;
            img.onload = imageEvtHandler;
            img.onerror = imageEvtHandler;
            img.src = images[i];
        }
    } else {
        if (typeof callback === "function")
            callback.call(this);
    }
}