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: 2320	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2320/19200c26046dc00f15305e03b7c1d28b4c38c952/dragdrop.js/clean/web/scripts/dragdrop.js