jQuery.loadBackgroundImage = function(name) {
    var image_url = "/static/i/bck/" + name;
    jQuery("<img>").attr("src", image_url).load( function() {
        var bh = document.getElementById("background_holder");
        $(bh).hide();
        bh.style.height = document.getElementById("background_escape").offsetHeight + "px";
        bh.style.backgroundImage = 'url("' + image_url + '")';
        $(bh).fadeIn("slow");
    })
}

jQuery.preLoadImages = function(images) {
    for (var i = 0, j = images.length; i < j; ++i) {
        jQuery("<img>").attr("src", images[i]);
    }
}