Modal Iframe Fullscreen

<script type="text/javascript">
    var mask = new ax5.ui.mask();
    var modal = new ax5.ui.modal();
    var modalCallBack = function(){
        modal.close();
    };
    $(document.body).ready(function () {

        $('#modal-open').click(function () {
            modal.open({
                width: 600,
                iframe: {
                    method: "get",
                    url: "modal-iframe-content.html",
                    param: "callBack=modalCallBack"
                },
                fullScreen: function () {
                    return ($(window).width() < 600);
                }
            }, function () {

            });
        });

    });
</script>