diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
new file mode 100644
index 0000000..5b4324b
--- /dev/null
+++ b/DependencyInjection/Configuration.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Gregwar\CaptchaBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+class Configuration implements ConfigurationInterface
+{
+    /**
+     * Generates the configuration tree.
+     * @return TreeBuilder
+     */
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder();
+        $rootNode = $treeBuilder->root('gregwar_captcha', 'array');
+        
+        $rootNode
+            ->children()
+                ->arrayNode('image')
+                    ->addDefaultsIfNotSet()
+                    ->children()
+                        ->scalarNode('width')->defaultValue(120)->end()
+                        ->scalarNode('height')->defaultValue(40)->end()
+                    ->end()
+                ->end()
+            ->end()
+        ;
+        return $treeBuilder;
+    }
+}
+
diff --git a/DependencyInjection/GregwarCaptchaExtension.php b/DependencyInjection/GregwarCaptchaExtension.php
index 5292533..d1769c4 100755
--- a/DependencyInjection/GregwarCaptchaExtension.php
+++ b/DependencyInjection/GregwarCaptchaExtension.php
@@ -12,12 +12,19 @@ class GregwarCaptchaExtension extends Extension
 {
     public function load(array $configs, ContainerBuilder $container)
     {
+
         $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
 
+        $configuration = new Configuration();
+        $config = $this->processConfiguration($configuration, $configs);
+
+        $container->setParameter('gregwar_captcha.image.height', $config['image']['height']);
+        $container->setParameter('gregwar_captcha.image.width', $config['image']['width']);
         $resources = $container->getParameter('twig.form.resources');
-        $resources[] = 'GregwarCaptchaBundle::captcha.html.twig';
-        $container->setParameter('twig.form.resources', $resources);
+        $container->setParameter('twig.form.resources',array_merge(array('GregwarCaptchaBundle::captcha.html.twig'), $resources));
+        
     }
+    
 }