rem: Sortable.options(dropon).onChange(element); 
add: droponOptions.onChange(element); 
context:   onEmptyHover: function(element, dropon) {    if(element.parentNode!=dropon) {      var oldParentNode = element.parentNode;      dropon.appendChild(element);      Sortable.options(oldParentNode).onChange(element);      Sortable.options(dropon).onChange(element);    }  },
meta: 287	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/287/bb2276098a5a21c35e5ee72b3097bd9d7caa919f/dragdrop.js/clean/actionpack/lib/action_view/helpers/javascripts/dragdrop.js