<?php
function ololourl_url_inbound_alter(&$path, $original_path, $path_language){
  $req = $_GET['q'].'?id='.$_GET['id'];
  if (preg_match('/^view_post.php\?id=(\d+)/', $req, $matches) ) {
    $path = 'node/'.$matches[1];
  }
}
?>