怎样在textarea中按Ctrl+回车提交表单？

<script   language="JavaScript">  
  function   KeyDown(){  
  if(!(event.shiftKey||event.altKey)&&event.keyCode==13&&event.ctrlKey)
 {  
  document.GroupSendForm.submit();  
  }  
  }  
  </script>  
  <form   name="GroupSendForm"   method="post">  
      <textarea   name="OtherPhone"   rows="15"   onKeyDown="return   KeyDown();"></textarea>  
      <input   type="submit"   name="Submit"   value="提交">  
  </form>