Comment Form not submitting

<?php if ('open' == $post->comment_status) : ?>
	<div id="comment-form">

	<?php if ( get_option('comment_registration') && !$user_ID ) : ?>
		<p>You must be <a href="<?php echo get_option('siteurl'); ?>/wp-login.php?redirect_to=<?php echo urlencode(get_permalink()); ?>">logged in</a> to post a comment.</p>
	<?php else : ?>
		<?php if ( $user_ID ) : ?>

			<p>Logged in as <a href="<?php echo get_option('siteurl'); ?>/wp-admin/profile.php"><?php echo $user_identity; ?></a>. <a href="<?php echo get_option('siteurl'); ?>/wp-login.php?action=logout" title="Log out of this account">Log out &raquo;</a></p><br />

		<?php else : ?>
	<form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
		<div id="comment-personaldetails">
			<p>
				<input type="text" name="name" id="name" value="<?php echo $comment_author; ?>" size="30" tabindex="1">
				<label for="name"><strong>Name</strong><?php if ($req) echo " (required)"; ?></label>
			</p>
			<p>
				<input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="30" tabindex="2">
				<label for="email"><strong>Email</strong><?php if ($req) echo " (required, will not be published)"; ?></label>
			</p>
			<p>
				<input type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>" size="30" tabindex="3">
				<label for="url"><strong>Website</strong></label>
			</p>
		</div>
		<?php endif; ?>
		<p>Post your comment:
			<textarea name="content" id="content" cols="60" rows="10" tabindex="4">
			</textarea>
		</p>
		<p>
			<input name="submit" type="submit" id="submit" tabindex="5" value="Submit" />
			<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />
		</p>
		<?php do_action('comment_form', $post->ID); ?>
		<div class="clear"></div>

	</form>
</div>
<?php endif; // If registration required and not logged in ?>

<?php endif;?>

Somehow, when I click the submit button, the page does not do anything. Have a missed anything anywhere?