замена картинки

if ($user['id'] != $user_id) { 
}else{ 
echo '<center><a href="album.php?act=ava_ust"><img src="../images/phota_gl.png" />Установить аватар</a></center>';
} 
if (file_exists('../files/users/photo/' . $user['id'] . '_small.jpg'))
    echo '<center><img src="../files/users/photo/' . $user['id'] . '_small.jpg" alt="' . $user['name'] . '"  boart="96" /><br /><a href="../files/users/photo/' . $user['id'] . '.jpg"><img src="../images/phota_gl.png" /> Увеличит</a></center>';
    else
    echo '<center><img src="/images/empty.png" width="96" height="96" alt="" /></center>&#160;';
    echo '<br/><b>' . core::$lng['where'] . ':</b> ' . functions::display_place($user['id'], $user['place']);
$arg = array( 
'lastvisit' => 1 
);