No need to manually edit the config file anymore, the installation is now completly automatic

admin/themes/admin/install.htm

 				<form action="install.php" method="post" id="config_form" autocomplete="off" class="newpost">
 					<fieldset class="install">
 						<legend class="install">Database Settings</legend>
+						{error.6}
 						<ul>
 							<li><label for="login">User:</label>
 								<input type="text" name="db_login" id="db_login" value="{db_login}" class="txt"/>{error.10}</li>

classes/install.class.php

             false;
         }
 
-        $this->create_db();
+        if (!$this->create_db()) {
+            return false;
+        }
 
         if (!$this->install_db()) {
             return false;
         $db_login = $this->data['db_login'];
         $db_password = $this->data['db_password'];
 
-        $link = new PDO("mysql:host=$db_host;dbname=$db_name", $db_login, $db_password);
+        try {
+          $link = new PDO("mysql:host=$db_host;dbname=$db_name", $db_login, $db_password);
+        }
+        catch (Exception $e)
+        {
+          return false;
+        }
 
         if (!$link) {
             die('Could not connect: ' . $link->errorInfo());
 
     public function install_db()
     {
-        require_once(Absolute_Path.'config.php');
-        $db = new Conexion_Mysql(DB_name, DB_Server, DB_User, DB_Password);
+        $db = new Conexion_Mysql($this->data['db_name'], $this->data['db_host'], $this->data['db_login'], $this->data['db_password']);
         $sqlStr = array();
 
         $sqlStr[] = "CREATE TABLE `".Table_prefix."data` ( `id_post` INT(11) NOT NULL AUTO_INCREMENT , `title` TEXT NULL , `url` VARCHAR(250) NULL DEFAULT NULL , `description` TEXT NULL , `type` TINYINT(4) NOT NULL DEFAULT '1' , `date` DATETIME NOT NULL , `id_user` INT(10) NOT NULL , PRIMARY KEY (`id_post`)) ENGINE = MyISAM;";
             }
         }
 
+        if($this->writeConfig($this->data['db_name'], $this->data['db_host'], $this->data['db_login'], $this->data['db_password']) === FALSE)
+        {
+          return false;
+        }
+
         return true;
     }
 
         return true;
     }
 
+    public function writeConfig($name, $host, $login, $password)
+    {
+      $strToWrite = "define('DB_Server', '$host');\ndefine('DB_name', '$name');\ndefine('DB_User', '$login');\ndefine('DB_Password', '$password');\n";
+      return file_put_contents(Absolute_Path.'config.php', $strToWrite, FILE_APPEND | LOCK_EX);
+    }
+
     public function mostrarerror($n)
     {
         if ($this->inerrors($n)) {

config.php

 
   =========================== */
 
-define('DB_Server', 'localhost');
-define('DB_name', '');
-define('DB_User', '');
-define('DB_Password', '');
 define('Table_prefix', 'gel_');

install.php

 $theme->set('version', $util_class->version());
 $theme->set('showForm', $install->showForm);
 
-$theme->set('db_login', isset($install->data['db_login'])? $install->data['db_login'] : DB_User);
-$theme->set('db_host', (!empty($install->data['db_host']))? $install->data['db_host'] : DB_Server);
-$theme->set('db_name', (!empty($install->data['db_name']))?  $install->data['db_name'] : DB_name);
+$theme->set('db_login', isset($install->data['db_login'])? $install->data['db_login'] : '');
+$theme->set('db_host', (!empty($install->data['db_host']))? $install->data['db_host'] : '');
+$theme->set('db_name', (!empty($install->data['db_name']))?  $install->data['db_name'] : '');
 $theme->set('login', isset($install->data['login'])?$install->data['login']:'');
 $theme->set('email', isset($install->data['email'])?$install->data['email']:'');
 $theme->set('title', isset($install->data['title'])?$install->data['title']:'');