Out event in droppable is not firing..................

Out event in droppable is not firing..................

hi  all................
i have a problem the out event is not firing properly any help would be appriciated.thanks
   $(function () {
       $("#draggable").draggable({revert:"invalid"});

       $("#droppable").droppable({
tolerance: 'touch',
           
           hoverClass: "ui-state-active",
           drop: function (event, ui) {
alert("Dropped!");

    $(ui.draggable).draggable( 'option', 'disabled', false );             
            $(this).droppable("disable");
               $(this).addClass("ui-state-highlight")
.find("p")
.html("arranged");           

           },
out :function(){
alert("out");
}


       });