只搜索文章系统的可以
<table>
<form id="form1" name="form1" method="get" action="/plus/search.asp">
<tr>
<td>
<input name="channelid" value=1 type="hidden">
<input name="keyword" type="text" size="15">
<input type="submit" name="Submit" value="站内搜索" />
</td>
</tr>
</form>
</table>