type='',lang='' ไม่มาตอนดึงมา edit ตรงไหนคับ ช่วยดูหน่อย

<?
$sql="SELECT * FROM tb_product WHERE id_product='$_GET[id_product]'";
$query=mysql_query($sql) or die (mysql_error());
echo $sql;
$rec=mysql_fetch_assoc($query);
?>
 <li>Language : 
                <select name="lang_txt" id="lang_txt" size="1">
                    <option>- choose -</option>
                	<option value="<? $rec['lang']?>"<? if($rec['lang']=='en'){?> selected <? };?>>Eng</option>
                	<option value="<? $rec['lang']?>"<? if($rec['lang']=='th'){?> selected <? };?>>Thai</option>
                </select>                
                Type : 
                <select name="type_txt" id="type_txt" size="1">
                	<option selected="selected">- choose -</option>
                	<option value="<? $rec['type']?>"<? if($rec['type']=='MenWD'){?> selected <? };?>>Men's Wedding Dress</option>
                	<option value="<? $rec['type']?>"<? if($rec['type']=='WomenWD'){?> selected <? };?>>Feemale's Wedding Dress</option>
                    <option value="<? $rec['type']?>"<? if($rec['type']=='Acc'){?> selected <? };?>>Accessoires</option>
                </select></li>

$sql_update="UPDATE tb_product  SET code='$_POST[code_txt]',type='$_POST[type_txt]',lang='$_POST[lang_txt]',title='$_POST[title_txt]',detail='$_POST[detail_txt]',price='$_POST[price_txt]',status='$_POST[rdo_status]',date_today='$datetoday' WHERE id_product=$_GET[id_product]";
$query_update=mysql_query($sql_update) or die (mysql_error());
echo $sql_update;