什么'；我的更新消息删除按钮有问题

我正在尝试升级代码以删除选定的消息。下面是我现有的代码，我想更改它，

<input type="hidden" name="action" value="delete" />
<input type="submit" name="deletebtn" value="Delete" onclick="if(!confirm('Are you sure you want to delete selected messages?')) return false;" />

$template->assign('script', 'messages');
if(isset($_POST['action']))
{
  $action = makesafe($_POST['action']);
  $ids = $_POST['msgid'];
  if(!empty($ids))
  {
  if($action == 'delete')
  {
          foreach($ids as $k => $v)
          {
                 if(!empty($v))
                 {
                    if(mysql_num_rows(mysql_query("SELECT * FROM messages WHERE receiver = '"logged id"' AND msg_id = '$v' LIMIT 1")))
                        {
                            if(mysql_query("DELETE FROM messages WHERE msg_id = $v AND receiver = '"logged id"' LIMIT 1"))
                                {
                                    $success_msg = "Message(s) Deleted.";
                                }
                        }
                 }
          }
  }
  }
}

我试过使用这个代码，但它不起作用，

<button type="submit" class="btn" name="delete" onclick="if(!confirm('Are you sure you want to delete selected links?')) return false;" > <i class="icol-cross"></i> Delete </button>

我还想验证用户是否在没有选择任何消息的情况下单击了删除按钮（复选框）。