gistfile1.txt

                   <?php 
                    $referring_url = get_post_meta($post->ID, 'referring_url', true);
                    $referring_url_name = get_post_meta($post->ID, 'referring_url_name', true);
                    $downloads = get_post_meta($post->ID, 'download_location', true);
                    $downloads_name = get_post_meta($post->ID, 'download_name', true);
  				$contact = get_post_meta($post->ID, 'contact_name', true);
					$contact_url = get_post_meta($post->ID, 'contact_url', true);

					if(empty($referring_url) && empty($downloads) && empty($contact)){
					//echo "foo!";
					}else{
					?>
					<ul class="cta">
                    <?php 
					// check if the custom field has a value
						if($referring_url != '') {
						?>
                        <li><a href="<?php echo  $referring_url; ?>" class="button url" rel="external" title="<?php echo  $referring_url; ?>"><?php echo  $referring_url_name; ?></a></li>
					<?php } 
					// check if the custom field has a value
						if($downloads != '') {
						?>
                        <li><a href="<?php echo  $downloads; ?>" class="button download" rel="external" title="<?php echo  $downloads; ?>"><?php echo  $downloads_name; ?></a></li>
                    <?php } 
					// check if the custom field has a value
						if($contact != '') {
						?> 
                        <li><a href="<?php echo  $contact_url; ?>" class="button contact" rel="external" title="<?php echo  $contact; ?>"><?php echo  $contact; ?></a></li>
                    <?php } 
                    }
                    ?> 
                    </ul>