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$(function() {
  $("ul.droptrue").sortable({
    connectWith: 'ul',
    opacity: 0.6,
    update : updatePostOrder
  });

  $("#sortable1, #sortable2").disableSelection();
  $("#sortable1, #sortable2").css('minHeight',$("#sortable1").height()+"px");
  updatePostOrder();
});

function updatePostOrder() { 
  var arr = [];
  $("#sortable2 li").each(function(){
    arr.push($(this).attr('id'));
  });
  $('#postOrder').val(arr.join(','));
}