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>