$("a.mbl").click(function() {

    var mblid = $(this).attr("id");

    $("#mid-box-left").fadeOut(250, function() {
        $("#mid-box-left").html($("#mbl" + mblid).html())
        .hide()
        .fadeIn(250, function () {
            $('#mid-box-left')

            $("#mid-box").on("mouseenter", "a.testbox", function() {

                var tbid = $(this).attr("id");

                $("#mid-box-right").fadeOut(250, function() {
                    $("#mbr" + tbid).css("display", "block")
                    .hide()
                    .fadeIn(250, function () {
                        $("#mbr" + tbid)
                    });
                });
            });

            $("#mid-box").on("mouseleave", "a.testbox", function() {

                var tbid = $(this).attr("id");

                $("#mbr" + tbid).fadeOut(250, function() {
                    $("#mbr" + tbid).css("display", "none");
                    $("#mid-box-right").fadeIn(250);
                });
            });
        });
    });
    return false;
})