diff --git a/share/tools/check.php b/share/tools/check.php
new file mode 100644
index 0000000..efd4d67
--- /dev/null
+++ b/share/tools/check.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * Check for required libraries and versions
+ *
+ * @author Steffen Vogel <info@steffenvogel.de>
+ * @copyright Copyright (c) 2010, The volkszaehler.org project
+ * @license http://www.gnu.org/licenses/gpl.txt GNU Public License
+ */
+/*
+ * This file is part of volkzaehler.org
+ *
+ * volkzaehler.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * volkzaehler.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with volkszaehler.org. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @param boolean
+ * @return string HTML formatted output
+ */
+function print_test($bool) {
+	if ($bool) {
+		return '<span style="text-align: right; color: green; font-weight: bold;">ok</span>';
+	}
+	else {
+		return '<span style="text-align: right; color: red; font-weight: bold;">fail</span>';
+	}
+}
+
+array(
+	'php_version' => version_compare(phpversion(), '5.3.0'),
+	'pdo' => extension_loaded('pdo'),
+	'pdo_version' => version_compare(phpversion('pdo'), '5.3.0')),
+	'pdo_my'
+
+extension_loaded('pdo_firebird')
+extension_loaded('pdo_informix')
+extension_loaded('pdo_mssql')
+extension_loaded('pdo_mysql')
+extension_loaded('pdo_oci')
+extension_loaded('pdo_oci8')
+extension_loaded('pdo_odbc')
+extension_loaded('pdo_pgsql')
+extension_loaded('pdo_sqlite')
+
+pdo_firebird
+pdo_informix
+pdo_mssql
+pdo_mysql
+pdo_oci
+pdo_oci8
+pdo_odbc
+pdo_pgsql
+pdo_sqlite
+
+)
+
+
+?>
+
+<h2>PHP version</h2>
+<p>Your PHP version: <?= phpversion() ?><br />
+Required version: 5.3.0<br />
+<?= print_test()?></p>
+
+<h2>PDO (PHP Data Objects)</h2>
+<p>Your PDO version: <?= phpversion('pdo') ?><br />
+Required version: 5.3.0<br />
+<?= print_test(FALSE && version_compare(phpversion('pdo'), '5.3.0'))?></p>
+
+// TODO check for PDO drivers (at least one)
+// TODO check for additional Doctrine requirements
+
+// TODO check for APC (optional)
+
+// TODO check for Doctrine libraries & version
+// TODO check for Symfony libraries &version (optional)
+// TODO check for volkszaehler.org backend
+// TODO check for volkszaehler.org (optional)
+
+?>
\ No newline at end of file
diff --git a/share/tools/generate_docs.php b/share/tools/generate_docs.php
index ae0a409..a9fff33 100644
--- a/share/tools/generate_docs.php
+++ b/share/tools/generate_docs.php
@@ -10,7 +10,6 @@
  * @author Steffen Vogel <info@steffenvogel.de>
  * @package tools
  * @license http://www.opensource.org/licenses/gpl-license.php GNU Public License
- * @todo propably we could put this into install.php later..
  */
 /*
  * This file is part of volkzaehler.org
diff --git a/share/tools/import_flo.php b/share/tools/import_flo.php
index a268299..e4f9bdd 100644
--- a/share/tools/import_flo.php
+++ b/share/tools/import_flo.php
@@ -5,6 +5,8 @@
  * @copyright Copyright (c) 2010, The volkszaehler.org project
  * @package tools
  * @license http://www.opensource.org/licenses/gpl-license.php GNU Public License
+ * @todo adapt to doctrine dbal or use native pdo
+ * @todo move to installer
  */
 /*
  * This file is part of volkzaehler.org
diff --git a/share/tools/import_justin.php b/share/tools/import_justin.php
index bcbbd63..02fc889 100644
--- a/share/tools/import_justin.php
+++ b/share/tools/import_justin.php
@@ -5,7 +5,8 @@
  * @copyright Copyright (c) 2010, The volkszaehler.org project
  * @package tools
  * @license http://www.opensource.org/licenses/gpl-license.php GNU Public License
- * @todo adapt to doctrine dal or use native mysql
+ * @todo adapt to doctrine dbal or use native pdo
+ * @todo move to installer
  */
 /*
  * This file is part of volkzaehler.org
diff --git a/share/tools/install.php b/share/tools/install.php
index 2d724c3..e11ea52 100644
--- a/share/tools/install.php
+++ b/share/tools/install.php
@@ -1,12 +1,15 @@
 <?php
 /**
- * install script
+ * Installer
  *
- * for creating/updating of the configuration/database
+ * For creating/updating the configuration/database
+ * and downloading of required libraries
+ * and configuration of of the PHP interpreter/webserver
  *
  * @copyright Copyright (c) 2010, The volkszaehler.org project
  * @package tools
  * @license http://www.opensource.org/licenses/gpl-license.php GNU Public License
+ * @todo finish
  */
 /*
  * This file is part of volkzaehler.org
@@ -31,22 +34,42 @@
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 	<head>
-		<title>volkszaehler.org - installer</title>
+		<title>volkszaehler.org - installation</title>
 	</head>
 	<body>
+	<h1>volkszaehler.org - installation</h1>
 
 <?php
 
-// TODO complete installer
+// TODO start session with GET-parameter (no cookies)
 
-switch (@$_GET['step']) {
-	case '1':
-		echo 'bla';
-		break;
-
-	default:
-		echo '<p>welcome to the installation of your volkszaehler backend!</p>
-			<p>lets proceed with the <a href="?step=1">next step</a></p>';
+if (isset($_GET['step'])) {
+	if (file_exists($_GET['step'] . '.php')) {
+		include $_GET['step'] . '.php';
+	}
+	else {
+		// TODO check js history call
+		echo '<span style="color: red; font-weight: bold;">Invalid step during installation: ' . $_GET['step'] . '</span>
+			<p><a href="javascript:window.location.back()">back</a></p>';
+	}
+}
+else {
+	echo <<<EOT
+<p>Welcome to the installation of your volkszaehler.org!<br />
+This installer will:
+<ul>
+	<li>check for all requirements</li>
+	<li>install missing libraries</li>
+	<li>setup your database + configuration</li>
+	<li>import your existing data</li>
+	<li>test your installation</li>
+</ul>
+Only fundamental administration knowledge is required :)
+</p>
+<p>
+So, ready? Take a cup of coffee and lets take a look on your system:</p>
+<p><a href="?step=check">Start with step 1: analyze your system</a></p>
+EOT;
 }
 
 ?>