Sortable helper

Sortable helper


hello!
it's any way to get the interface helper ( http://interface.eyecon.ro/demos/sort_floats.html
) on UI sortables?
i've tryed with:
$("#formItems").sortableDestroy().sortable({
        items: '.dragThis',
        handle: '.move',
        helper: function() {
            var myHelper = document.createElement("div");
            $(myHelper).css({
                background: 'yellow',
                width: this.offsetWidth + 'px',
                height: this.offsetHeight + 'px',
                opacity: 0.6,
                position: 'absolute'
            });
            return myHelper;
        }
    });
but doesent work.
Thanks!