Code:
           var droptarget=new Ext.dd.DropTarget('images');
            droptarget.notifyDrop=function(dd, e, data){
              var temp = String.format('<div class="thumb-wrap" ><div class="thumb"><img src="/image/{0}" class="thumb-img"></div><span>{0}</span></div>',dd.id);
              Ext.DomHelper.insertHtml('afterbegin',imgBody,'<div class="thumb-wrap" ><div class="thumb"><img src="/image/dance_fever.jpg" class="thumb-img"></div><span>dance_fever.jpg</span></div>');
              console.log("dropped " + dd.id + " on dragtarget", e);
              //imgBody.update('<div class="thumb-wrap" ><div class="thumb"><img src="/image/dance_fever.jpg" class="thumb-img"></div><span>dance_fever.jpg</span></div>');
              return true;
            }