刪除確認??

if(!confirm('是否確定要刪除?')){return false;}"

在OnClientClick中加入
or

return confirm('確認要刪除嗎？');

or

<script language="javascript" type="text/javascript">
 function ConfirmDeletion() {
  if (event.srcElement.value == "刪除" )
  event.returnValue = confirm("確定要刪除嗎？");
 } document.onclick = ConfirmDeletion;
</script>