Кол-во товаров на страницу по выбору посетителя

<form method="post" id="iteminator" name="iteminator">
Товаров на страницу:
<select name="ITEMS_ON_PAGE" onChange="document.iteminator.submit();">
<option value="10">10</option>
<option value="20">20</option>
<option value="30">30</option>
<option value="60">60</option>
</select>
</form>

"PAGE_ELEMENT_COUNT" => $_REQUEST['ITEMS_ON_PAGE'],

<option value="10" <? if($_REQUEST['ITEMS_ON_PAGE']==10) echo ' selected="selected" '?>>10</option>

if(isset($_REQUEST['ITEMS_ON_PAGE']))
{
$_SESSION['ITEMS_ON_PAGE'] = $_REQUEST['ITEMS_ON_PAGE'];
}
...
<option value="10" <? if($_SESSION['ITEMS_ON_PAGE']==10) echo ' selected="selected" '?>>10</option>

if(isset($_REQUEST['ITEMS_ON_PAGE']))
{
$_SESSION['ITEMS_ON_PAGE'] = $_REQUEST['ITEMS_ON_PAGE'];
} else {
$_SESSION['ITEMS_ON_PAGE'] = 9;
}

else { 
$_SESSION['ITEMS_ON_PAGE'] = 9; 
}