从表格中选择“特定名称”或“全部”

Question

现在我从表中调用taman section，我只想调用特定的taman节或调用表中的所有taman section，我怎么能这样做？ 贝娄是我的代码：
post.php中：

<select name="taman"> 
<option value="taman1">Taman1</option> 
<option value="tamanA">TamanA</option> 
<option value="*">ALL</option> 
</select> 

select.php

$taman = $_POST["taman"]; //this taman are post from post.php,I have tried put value * to this $taman, but still cannot. 

$qry="SELECT cusinfo.* FROM cusinfo 
         WHERE cusinfo.TAMAN_SECTION = '$taman' 
         ";