Multiple custom field values

Hello,
i was searching this forum but coludnt find what i was looking for.
Im using this code to display multiple custom field values:

<?php
$custom_field = get_post_meta($post->ID, "custom_field", false);
if ($mjesto[0]=="") { ?>

<!-- If there are no custom fields, show nothing -->

<?php } else { ?>
<?php foreach($custom_field as $custom_field) {
	echo $custom_field. ', ' ;
	} ?>

<?php } ?>

This is what i need:
-if only 1 custom field value is entered, display it.
-if more than one custom field is entered, display custom message.

So if you guys colud edit the code above…
thanks in advance!