Extreme challenge -custom fields value

I need to have several links listed from my custom fields. With the script below I can output one url and the link text. But, If I duplicate the custom field value, it still only echoes the first input. How to mod this script in order to output several custom field values?

<?php
$link = get_post_meta($post->ID, 'link_url', true);
$text = get_post_meta($post->ID, 'link_text', true);
 if ($link){
echo '&nbsp;&middot; <a href="'.$link .'">'.$text.'</a>&nbsp;';
}
?>