สอบถามการส่งค่าแบบ MULTI DROP DOWN BOX หน่อยครับ!!!!!!!!!!!!!!!!!!!!11

<form name="form1" method="post" action="">
<select name="domain[]" multiple="multiple" size="4" class="selectbox">

      <option value="1">Accounting</option>

      <option value="2">Engineering</option>

      <option value="3">Internet</option>

      <option value="4">Sales</option>

</select> 

	<input type="submit" value="submit">
</form>

<?
foreach($domain as $value)

{
    echo $value."<BR>";   // I don't receive the value.
}
?>