jump menu หนูอยากใช้ jumpmenu เพื่อที่จะเลือกหมวดหมู่ แบบว่า เลือกหมวดหมูนี้ก็จะโชว์ในหมวดนั้นทั้งหมด

<?
	$sqlListKnow = "SELECT knowledge.*,category_knowledge.cate_name
					FROM knowledge
					INNER JOIN category_knowledge
					ON knowledge.cate_id = category_knowledge.cate_id";
	$resultListKnow = mysql_query($sqlListKnow,$conn);
	
		$sql = "SELECT * FROM category_knowledge";
		$result = mysql_query($sql,$conn);
?>
<p><br>
    <strong>เกร็ดความรู้</strong>
  <br>
</p><br>

<div align="right">
<script type="text/javascript">
	function selectKnow(){
		if(document.getElementById('knowledge').value > 0){
			window.location='?name=knowledge&='+document.getElementById('knowledge').value;
		}
	}
</script>
<form name="knowledge" method="post" action="">
	<select name="knowledge" id="knowledge" onChange="selectKnow();">
		<option value="0">--หมวดหมู่ทั้งหมด--</option>
		<? while ($data = mysql_fetch_array($result)){ ?>
		<option value="<?=$data['cate_id']?>"><?=($data['cate_name']);?></option>
		<? }?>
	</select>
</form>
</div>
<? while ($dataKnow = mysql_fetch_array ($resultListKnow)){
		if ($dataKnow){?>
			<tr align = "center" >
			<td><b>หมวดหมู่   :  </b></td>
			<td><?=$dataKnow['cate_name'] ?></td><br>
				<td> <a href="?name=knowledge&file=detail_know&id=<?=$dataKnow['kn_id']?>">
					 <? if( $dataKnow['picture']){ ?> 
						<img src="images/knowledge/<?=$dataKnow['picture']?>" />
				     <? }else {?>
						<img src="images/knowledge/knowledge_blank.gif"/>
					 <? }?>
				</a></td>
      			<td><b><a href="?name=knowledge&file=detail_know&id=<?=$dataKnow['kn_id']?>">
				<?=$dataKnow['title']?></a></b></td>
				<td><?=$dataKnow['text_kn']?>....</td><br><br>
							
<? } 
		}?>