<form action="notice.php" method="get">
...
<button type='button' onclick ="search_wj()" class="btn btn-ok">查詢</button>
</form>

<form action="notice.php" onsubmit="search_wj();return false;" method="get">
...
<button type='button' onclick ="search_wj()" class="btn btn-ok">查詢</button>
</form>