Remove option to drop onto area once item is dropped
<p>I have draggable &amp; droppable : </p>

<pre><code>$(function() {
    $("li").sortable({
        revert : true,
    }).draggable({
        connectToSortable : ".removeCss",
    });

    $( ".holder" ).droppable({ drop: function( event, ui ) 
    { 
        $("myDiv").addClass("addCss");
        $("myDiv").removeClass("removeCss");
    } 
}); 
</code></pre>

<p>When I drop an item, I need the droppable area to longer accept draggable items. Do I need to refresh the div ?</p>
