Random Custom Fields

Hi,

I’ve got several custom fields for each post in my website.

On the homepage, i’d like to show in the header, 3 of these custom fields, named “librairie”, “librairie_logo” and “librairie_nom”.

“librairie_nom” is text. “librairie_logo” is the picture of “librairie_nom” and “librairie” is the hyperlink of “librairie_logo”.

How can i do this with this code ?

<?php

$random_query = new WP_Query(array(
'post__not_in' => $do_not_duplicate,
'showposts' => 7,
'cat' => 3,
'orderby' => 'rand',
'meta_query' => array(
		array(
			'key' => 'couv',
			'value' => '',
			'compare' => '!='
		)
)
));
echo ('<div style="font-size: 14px; font-weight: bold; color: #FFFFFF; text-transform: uppercase; text-shadow: 1px 1px 1px #000000; margin-bottom: -25px;margin-top: -130px; margin-right: 230px; position: relative; text-align: right;"><blink>également sur livresque</blink></div><br />');
while ($random_query->have_posts()) : $random_query->the_post(); ?>
<div class="featured-random-apps" style="float:right"><br /><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><img src="<?php $values = get_post_custom_values("couv"); echo $values[0]; ?>" alt="<?php the_title(); ?>" width="86" height="135" border="0" /></a>&nbsp;&nbsp;</div>
<?php endwhile; ?><div style="clear:both"><br /></div>
	<?php
		wp_reset_query();
		 ?>

Thanks.