Affichage de liste SQL

<?php
$connect = mysql_connect('localhost','root','mdp') or die ("erreur de connexion serveur");
mysql_select_db('base',$connect) or die ("erreur de connexion base");
?>
<table width="90%" align="center" border="1" cellpadding="0" cellspacing="0" class="test">
<tr>
<?php
$result = mysql_query("SELECT * FROM table WHERE pic_thumbnail<>'' AND pic_cat_id='$cat_id'");
while ( $row = mysql_fetch_array($result)){
echo '
<td width="25%" align="center"><font size="-1"><a href="index2.php?pic_id='.$row[pic_id].'">'.$row[pic_title].'</a></font><br>
<a href="index2.php?pic_id='.$row[pic_id].'"><img src="tn/'.$row[pic_thumbnail].'" border="0" alt="'.$row[pic_title].'"></a></td>'
;}
?>