if you add this code to the top of the page that your form submits to, then you will see how PHP structures the POST data you're sending it:
PHP Code:
<?
if ($_POST) {
echo "<pre>"; print_r($_POST); echo "</pre>";
}
generally, you would access POST data with the following format: $_POST['varname']
i don't understand your final question really, but i thought this info may be relevant.