diff --git a/application/config/config.php b/application/config/config.php
index d34579b..23c49dd 100644
--- a/application/config/config.php
+++ b/application/config/config.php
@@ -1,6 +1,6 @@
 <?php 
 
-$config['base_url'] = ''; // Base URL including trailing slash (e.g. http://localhost/)
+$config['base_url'] = ROOT_DIR; // Base URL including trailing slash (e.g. http://localhost/)
 
 $config['default_controller'] = 'main'; // Default controller to load
 $config['error_controller'] = 'error'; // Controller used for errors (e.g. 404, 500 etc)
@@ -10,4 +10,4 @@
 $config['db_username'] = ''; // Database username
 $config['db_password'] = ''; // Database password
 
-?>
\ No newline at end of file
+?>
diff --git a/application/controllers/error.php b/application/controllers/error.php
index 99d72f7..1993770 100644
--- a/application/controllers/error.php
+++ b/application/controllers/error.php
@@ -2,15 +2,30 @@
 
 class Error extends Controller {
 	
-	function index()
-	{
-		$this->error404();
+	function index($segments){
+		return $this->error($this->getMessage($segments));
 	}
-	
-	function error404()
-	{
-		echo '<h1>404 Error</h1>';
-		echo '<p>Looks like this page doesn\'t exist</p>';
+
+	function getMessage($segments){
+		if(is_array($segments)){
+			$segments = $segments[0];
+		}
+
+		return $segments;
+	}
+
+	function error($segments="Error!"){
+		if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
+			return json_encode(array(
+				'success' => false, 
+				'data' => array(),
+				'msg'=> utf8_encode($segments)
+			));
+		}
+		else{
+			return utf8_decode("<h1>{$segments}</h1>");
+		}
+		
 	}
     
 }
diff --git a/application/controllers/main.php b/application/controllers/main.php
index b1c40ac..ace01bc 100644
--- a/application/controllers/main.php
+++ b/application/controllers/main.php
@@ -7,6 +7,18 @@ function index()
 		$template = $this->loadView('main_view');
 		$template->render();
 	}
+	
+	function categoryAjax(){
+		$model = $this->loadModel('example_model');
+		
+		$response = $model->getProjetos();
+		if($response[0] === true){
+			$this->render(array('data'=>$response[1]));
+		}
+		else{
+			$this->render(array('data'=>array(), 'error'=> $response[1]));	
+		}
+	}
     
 }
 
diff --git a/application/models/example_model.php b/application/models/example_model.php
index 18c960a..5f1b0ad 100644
--- a/application/models/example_model.php
+++ b/application/models/example_model.php
@@ -2,10 +2,8 @@
 
 class Example_model extends Model {
 	
-	public function getSomething($id)
-	{
-		$id = $this->escapeString($id);
-		$result = $this->query('SELECT * FROM something WHERE id="'. $id .'"');
+	public function getCategory(){
+		$result = $this->query('SELECT * FROM category');
 		return $result;
 	}
 
diff --git a/index.php b/index.php
index ed8010b..356743f 100644
--- a/index.php
+++ b/index.php
@@ -1,26 +1,28 @@
 <?php
 /*
- * PIP v0.5.3
+ * PIP v0.5.4
  */
 
 //Start the Session
 session_start(); 
 
 // Defines
-define('ROOT_DIR', realpath(dirname(__FILE__)) .'/');
-define('APP_DIR', ROOT_DIR .'application/');
+define('DS', DIRECTORY_SEPARATOR);
+
+define('ROOT_DIR', realpath(dirname(__FILE__)) . DS);
+define('APP_DIR', ROOT_DIR .'application' . DS);
 
 // Includes
-require(APP_DIR .'config/config.php');
-require(ROOT_DIR .'system/model.php');
-require(ROOT_DIR .'system/view.php');
-require(ROOT_DIR .'system/controller.php');
-require(ROOT_DIR .'system/pip.php');
+require(APP_DIR  .'config'. DS .'config.php');
+require(ROOT_DIR .'system'. DS .'model.php');
+require(ROOT_DIR .'system'. DS .'view.php');
+require(ROOT_DIR .'system'. DS .'controller.php');
+require(ROOT_DIR .'system'. DS .'application.php');
 
 // Define base URL
 global $config;
 define('BASE_URL', $config['base_url']);
 
-pip();
+new pip();
 
 ?>
diff --git a/system/controller.php b/system/controller.php
index dc51490..0000807 100644
--- a/system/controller.php
+++ b/system/controller.php
@@ -2,39 +2,47 @@
 
 class Controller {
 	
-	public function loadModel($name)
-	{
-		require(APP_DIR .'models/'. strtolower($name) .'.php');
+	public function loadModel($name){
+		require(APP_DIR .'models'. DS . strtolower($name) .'.php');
 
 		$model = new $name;
 		return $model;
 	}
 	
-	public function loadView($name)
-	{
+	public function loadView($name){
 		$view = new View($name);
 		return $view;
 	}
 	
-	public function loadPlugin($name)
-	{
-		require(APP_DIR .'plugins/'. strtolower($name) .'.php');
+	public function loadPlugin($name){
+		require(APP_DIR .'plugins'. DS . strtolower($name) .'.php');
 	}
 	
-	public function loadHelper($name)
-	{
-		require(APP_DIR .'helpers/'. strtolower($name) .'.php');
+	public function loadHelper($name){
+		require(APP_DIR .'helpers'. DS . strtolower($name) .'.php');
 		$helper = new $name;
 		return $helper;
 	}
 	
-	public function redirect($loc)
-	{
+	public function redirect($loc){
 		global $config;
 		
 		header('Location: '. $config['base_url'] . $loc);
 	}
+
+	public function render($response=array(), $tipo='json'){
+		$tipo = strtolower($tipo);
+		if($tipo === 'json'){
+			die(json_encode($response));
+		}
+		else if($tipo === 'jsonp'){
+			die($_REQUEST['callback'] . '(' . json_encode($response) . ');' );
+		}
+		else{
+			echo $response;
+		}
+	}
     
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/system/model.php b/system/model.php
index 04503ca..8ad624e 100644
--- a/system/model.php
+++ b/system/model.php
@@ -1,62 +1,72 @@
 <?php
 
-class Model {
+class Model extends PDO{
 
 	private $connection;
 
-	public function __construct()
-	{
+	public function __construct(){
 		global $config;
-		
-		$this->connection = mysql_pconnect($config['db_host'], $config['db_username'], $config['db_password']) or die('MySQL Error: '. mysql_error());
-		mysql_select_db($config['db_name'], $this->connection);
+
+		try{
+			$dsn = "mysql:dbname={$config['db_name']};host={$config['db_host']}";
+			$this->connection = parent::__construct($dsn, $config['db_username'], $config['db_password']);
+			parent::setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+			return array(true, $this->connection);
+		}
+		catch(PDOException $e){
+			return array(false, $e->getMessage());
+		}
 	}
 
-	public function escapeString($string)
-	{
+	//deprecated
+	public function escapeString($string){
 		return mysql_real_escape_string($string);
 	}
 
-	public function escapeArray($array)
-	{
+	//deprecated
+	public function escapeArray($array){
 	    array_walk_recursive($array, create_function('&$v', '$v = mysql_real_escape_string($v);'));
 		return $array;
 	}
 	
-	public function to_bool($val)
-	{
+	public function to_bool($val){
 	    return !!$val;
 	}
 	
-	public function to_date($val)
-	{
+	public function to_date($val){
 	    return date('Y-m-d', $val);
 	}
 	
-	public function to_time($val)
-	{
+	public function to_time($val){
 	    return date('H:i:s', $val);
 	}
 	
-	public function to_datetime($val)
-	{
+	public function to_datetime($val){
 	    return date('Y-m-d H:i:s', $val);
 	}
 	
-	public function query($qry)
-	{
-		$result = mysql_query($qry) or die('MySQL Error: '. mysql_error());
-		$resultObjects = array();
+	public function query($qry, $params=array()){
+		try{
+			$pdo = $this->prepare($qry);
+			$pdo->execute($params);
 
-		while($row = mysql_fetch_object($result)) $resultObjects[] = $row;
+			return array(true, $pdo->fetchAll(PDO::FETCH_OBJ));
+		}
+		catch(PDOException $e){
+			return array(false, $e->getMessage());
+		}
 
-		return $resultObjects;
 	}
 
-	public function execute($qry)
-	{
-		$exec = mysql_query($qry) or die('MySQL Error: '. mysql_error());
-		return $exec;
+	public function execute($qry, $params=array()){
+		try{
+			$pdo = $this->prepare($qry);
+			$pdo->execute($params);
+			return array(true, $pdo->rowCount());
+		}
+		catch(PDOException $e){
+			return array(false, $e->getMessage());
+		}
 	}
     
 }
diff --git a/system/pip.php b/system/pip.php
index c69195c..4332b87 100644
--- a/system/pip.php
+++ b/system/pip.php
@@ -1,47 +1,65 @@
 <?php
 
-function pip()
-{
-	global $config;
-    
-    // Set our defaults
-    $controller = $config['default_controller'];
-    $action = 'index';
-    $url = '';
-	
-	// Get request url and script url
-	$request_url = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
-	$script_url  = (isset($_SERVER['PHP_SELF'])) ? $_SERVER['PHP_SELF'] : '';
-    	
-	// Get our url path and trim the / of the left and the right
-	if($request_url != $script_url) $url = trim(preg_replace('/'. str_replace('/', '\/', str_replace('index.php', '', $script_url)) .'/', '', $request_url, 1), '/');
-    
-	// Split the url into segments
-	$segments = explode('/', $url);
-	
-	// Do our default checks
-	if(isset($segments[0]) && $segments[0] != '') $controller = $segments[0];
-	if(isset($segments[1]) && $segments[1] != '') $action = $segments[1];
-
-	// Get our controller file
-    $path = APP_DIR . 'controllers/' . $controller . '.php';
-	if(file_exists($path)){
-        require_once($path);
-	} else {
-        $controller = $config['error_controller'];
-        require_once(APP_DIR . 'controllers/' . $controller . '.php');
+
+class pip {
+	private $controller;
+	private $action;
+	private $url;
+
+	function __construct(){
+		$segments = $this->startParams();
+		$segments = $this->startActions($segments);
+		
+		$obj = new $this->controller;
+		die(call_user_func_array(array($obj, $this->action), array($segments)));
+	}
+
+	function startParams(){
+		global $config;
+
+		$this->controller = $config['default_controller'];
+	    $this->action = 'index';
+	    $this->url = APP_DIR;
+
+	    $request_url = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
+		$script_url  = (isset($_SERVER['PHP_SELF'])) ? $_SERVER['PHP_SELF'] : '';
+
+		if($request_url != $script_url){
+			$this->url = trim(preg_replace('/'. str_replace('/', '\/', str_replace('index.php', '', $script_url)) .'/', '', $request_url, 1), '/');
+		} 
+		$segments = explode('/', $this->url);
+
+		if(isset($segments[0]) && $segments[0] != '') $this->controller = $segments[0];
+		if(isset($segments[1]) && $segments[1] != '') $this->action = $segments[1];
+
+		return $segments;
 	}
-    
-    // Check the action exists
-    if(!method_exists($controller, $action)){
-        $controller = $config['error_controller'];
-        require_once(APP_DIR . 'controllers/' . $controller . '.php');
-        $action = 'index';
-    }
-	
-	// Create object and call method
-	$obj = new $controller;
-    die(call_user_func_array(array($obj, $action), array_slice($segments, 2)));
+
+	function startActions($segments){
+		global $config;
+		
+		$path = APP_DIR . 'controllers' . DS . $this->controller . '.php';
+		$controller = $this->controller;
+
+		if(file_exists($path)){
+	        require_once($path);
+		} else {
+			$segments[0] = "Controller '{$controller}' Not Found! ";
+	        $this->controller = $config['error_controller'];
+	        require_once(APP_DIR . 'controllers' . DS . $this->controller . '.php');
+		}
+	    
+	    if(!method_exists($this->controller, $this->action)){
+			$this->action = 'index';
+			$action = $this->action;
+	    	$segments[0] = "Method '{$action}' in Controller '{$controller}' Not Found! ";
+	        $this->controller = $config['error_controller'];
+	        require_once(APP_DIR . 'controllers' . DS . $this->controller . '.php');
+	    }
+
+	    return $segments;
+	}
+
 }
 
 ?>
diff --git a/system/view.php b/system/view.php
index 1548f6a..5a920f4 100644
--- a/system/view.php
+++ b/system/view.php
@@ -5,18 +5,15 @@ class View {
 	private $pageVars = array();
 	private $template;
 
-	public function __construct($template)
-	{
-		$this->template = APP_DIR .'views/'. $template .'.php';
+	public function __construct($template){
+		$this->template = APP_DIR . 'views' . DS . $template .'.php';
 	}
 
-	public function set($var, $val)
-	{
+	public function set($var, $val){
 		$this->pageVars[$var] = $val;
 	}
 
-	public function render()
-	{
+	public function render(){
 		extract($this->pageVars);
 
 		ob_start();
@@ -26,4 +23,4 @@ public function render()
     
 }
 
-?>
\ No newline at end of file
+?>