yes you can, with PHP.
What I would do is add the following code to each page:
<?
$url = $_SERVER['SERVER_NAME'];
$page = $_SERVER['php_SELF'];
?>
Than add a hidden field to each form (so the user won't see it):
<input type="hidden" name="page_url" value=""http://".$url.$page">
That way you know from what URL each form was submitted.