combo box using arrays

<form name="order_form" action="http://localhost/myforum/index.php" method="GET">
<input type="hidden" value="1" name="forum" />
<select name="order_by" style="margin-left:5px;">
<option name="order_by_option" value="Array"/>Order By: Ascending</option>
<option name="order_by_option" value="Array"/>Order By: Descending</option>
</select>
<input type="submit" value="Order" />
</form>


Basically all i want to do is have Order By: Ascending and the relevent option value to be asc
or Order: By Descending and its option value to be desc. I thought I could use an array like:

$order_name = array('Ascending', 'Descending');$order_value = array('asc' => 'Ascending', 'desc' => 'Descending');

and then have a foreach loop to echo the options for how ever many there are in the array like so:

foreach ($order_name as $i)

{

echo "<option name=\"order_by_option\" value=\"{$order_value}\"/>";

echo "Order By: {$i}";

echo "</option>";

}