Mysql Left join little problem

[joomphp]

hi!
i have little problem with left join

below script working but i want to add restriction

field_id = 16 (any value)
and
user_id = 65 (any value)

pls help me how to do this

id 	user_id 	field_id 	value

<?php
  $dbHost   =  "localhost";
 $dbUser   =  "root";
 $dbPass   =  "123";
 $dbName   =  "family";
 $options = ''; 
 
 $link=mysql_connect("$dbHost","$dbUser","$dbPass");
 if(!$link){exit(mysql_error());}
 mysql_select_db("$dbName",$link) or exit(mysql_error());
 
function display_children($value, $level) {
    $result = mysql_query("SELECT a.user_id, Deriv1.Count FROM `jos_community_fields_values` a LEFT OUTER JOIN (SELECT value, COUNT(*) AS Count FROM `jos_community_fields_values` GROUP BY value) Deriv1 ON a.user_id = Deriv1.value WHERE a.value=" . $value);
    echo "<ul>";
    while ($row = mysql_fetch_assoc($result)) {
        if ($row['Count'] > 0) {
            echo '<li><a>'.$row['user_id'].'</a>';
			display_children($row['user_id'], $level + 1);
			echo "</li>";
        } elseif ($row['Count']==0) {
            echo '<li><a>'.$row['user_id'].'</a></li>';
        } else;
    }
    echo "</ul>";
}


echo display_children(0, 1);
print mysql_error();
?>