how to move a Dropped object using jquery?

how to move a Dropped object using jquery?

I am designing an web application where I need to move the dropped object also.but once i drop an object it becomes fixed in the position where it is dropped.my codes for dropping the object are as follows:

$( "#droppable" ).droppable({
            drop: function( event, ui ) {
                    document.getElementById('droppable').innerHTML = "test";
                    $("#droppable").css('background-image', 'url(' + $(ui.draggable).attr("src") + ')');                   
            }
        });

Can anyone please suggest me some solution for this?