diff --git a/README b/README
index 888f14e..a609600 100755
--- a/README
+++ b/README
@@ -24,8 +24,9 @@ Features:
 Todo
 - install script
 - custom icons
-- admin page (users management)
+- admin menu (users management)
 - track editing
+- track display filters (accurracy, provider)
 
 License
 - GPL
diff --git a/adduser.php b/adduser.php
new file mode 100644
index 0000000..ebc4632
--- /dev/null
+++ b/adduser.php
@@ -0,0 +1,92 @@
+<?php
+/* μlogger
+ *
+ * Copyright(C) 2017 Bartek Fabiszewski (www.fabiszewski.net)
+ *
+ * This is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Library General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+ 
+  require_once("auth.php");
+  
+  /** 
+   * Exit with xml response
+   * @param boolean $isError Error if true
+   * @param string $errorMessage Optional error message
+   */
+  function exitWithStatus($isError, $errorMessage = NULL) {
+    header("Content-type: text/xml");
+    $xml = new XMLWriter();
+    $xml->openURI("php://output");
+    $xml->startDocument("1.0");
+    $xml->setIndent(true);
+    $xml->startElement('root');
+      $xml->writeElement("error", (int) $isError);
+    if ($isError) {
+      $xml->writeElement("message", $errorMessage);
+    }
+    $xml->endElement();
+    $xml->endDocument();
+    $xml->flush();
+    exit;
+  }
+
+  /** 
+   * Check if login is allowed
+   * @param string $login Login
+   */
+  function checkUser($login) {
+    global $mysqli;
+    $sql = "SELECT id FROM users WHERE login = ?";
+    $query = $mysqli->prepare($sql);
+    $query->bind_param('s', $login);
+    $query->execute();
+    if ($query->errno) {
+      exitWithStatus(true, $query->error);
+    }
+    $query->store_result();
+    if ($query->num_rows) {
+      exitWithStatus(true, "User exists");
+    }
+    $query->free_result();
+    $query->close();
+  }
+
+  /** 
+   * Add new user to database
+   * @param string $login Login
+   * @param string $hash Password hash
+   */
+  function insertUser($login, $hash) {
+    global $mysqli;
+    $sql = "INSERT INTO users (login, password) VALUES (?, ?)";
+    $query = $mysqli->prepare($sql);
+    $query->bind_param('ss', $login, $hash);
+    $query->execute();
+    if ($query->errno) {
+      exitWithStatus(true, $query->error);
+      $isError = false;
+    }
+    $query->close();
+  }
+
+  $login = isset($_REQUEST['login']) ? trim($_REQUEST['login']) : NULL;
+  $hash = isset($_REQUEST['pass']) ? password_hash($_REQUEST['pass'], PASSWORD_DEFAULT) : NULL;
+  if ($admin && !empty($login) && !empty($hash)) {
+    checkUser($login);
+    insertUser($login, $hash);
+  }
+  exitWithStatus(false);
+  
+?>
\ No newline at end of file
diff --git a/admin.js b/admin.js
new file mode 100644
index 0000000..3bc693f
--- /dev/null
+++ b/admin.js
@@ -0,0 +1,79 @@
+/* μlogger
+ *
+ * Copyright(C) 2017 Bartek Fabiszewski (www.fabiszewski.net)
+ *
+ * This is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Library General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+function showModal(contentHTML) {
+  var div = document.createElement("div");
+  div.setAttribute("id", "modal");
+  div.innerHTML = '<div id="modal-header"><button type="button" onclick="removeModal()">&times;</button></div><div id="modal-body"></div>';
+  document.body.appendChild(div);
+  var modalBody = document.getElementById('modal-body');
+  modalBody.innerHTML = contentHTML;
+}
+
+function removeModal() {
+  document.body.removeChild(document.getElementById('modal'));
+}
+
+function addUser() {
+  var form = '<form id="userForm" method="post" onsubmit="submitUser(); return false">';
+  form += '<label><b>User name</b></label><input type="text" placeholder="Enter user login" name="login" required>';
+  form += '<label><b>Password</b></label><input type="password" placeholder="Enter Password" name="pass" required>';
+  form += '<label><b>Repeat password</b></label><input type="password" placeholder="Enter Password" name="pass2" required>';
+  form += '<button type="button" onclick="removeModal()">Cancel</button><button type="submit">Submit</button>';
+  form += '</form>';
+  showModal(form);
+}
+
+function submitUser() {
+  var form = document.getElementById('userForm');
+  var login = form.elements['login'].value;
+  var pass = form.elements['pass'].value;
+  var pass2 = form.elements['pass2'].value;
+  if (!login || !pass || !pass2) {
+    alert("All fields are required");
+    return;
+  }
+  if (pass != pass2) {
+    alert("Passwords don't match");
+    return;
+  }
+  var xhr = getXHR();
+  xhr.onreadystatechange = function() {
+    if (xhr.readyState==4 && xhr.status==200) {
+      var xml = xhr.responseXML;
+      var message = "";
+      if (xml) {
+        var root =  xml.getElementsByTagName('root');
+        if (root.length && getNode(root[0], 'error') == 0) {
+          removeModal();
+          alert("User successfully added");
+          return;
+        }
+        errorMsg = getNode(root[0], 'message');
+        if (errorMsg) { message = errorMsg; }
+      }
+      alert("Something went wrong\n" + message);
+      xhr = null;
+    }
+  }
+  xhr.open('POST', 'adduser.php', true);
+  xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
+  xhr.send('login=' + login + '&pass=' + pass);
+  return;
+}
\ No newline at end of file
diff --git a/auth.php b/auth.php
index 6336edf..7888ca2 100755
--- a/auth.php
+++ b/auth.php
@@ -95,7 +95,7 @@ if ($require_authentication || defined('headless')) {
     $query = $mysqli->prepare("SELECT id, login, password FROM users WHERE login=? LIMIT 1");
     $query->bind_param('s', $user);
     $query->execute();
-    $query->bind_result($rec_ID, $rec_user, $rec_pass);
+    $query->bind_result($rec_id, $rec_user, $rec_pass);
     $query->fetch();
     $query->free_result();
     //correct pass
@@ -111,14 +111,9 @@ if ($require_authentication || defined('headless')) {
       if (($user == $admin_user) && !empty($admin_user)) {
           $_SESSION['admin'] = $admin_user;
       }
-      $_SESSION['auth'] = $rec_ID;
-      if (defined('headless')) {
-        $url = str_replace("//", "/", $_SERVER['HTTP_HOST'].dirname($_SERVER['SCRIPT_NAME'])."/client/index.php");
-        header("Location: $ssl://$url");
-      } else {
-        $url = str_replace("//", "/", $_SERVER['HTTP_HOST'].dirname($_SERVER['SCRIPT_NAME'])."/index.php");
-        header("Location: $ssl://$url");
-      }
+      $_SESSION['auth'] = $rec_id;
+      $url = str_replace("//", "/", $_SERVER['HTTP_HOST'].dirname($_SERVER['SCRIPT_NAME'])."/index.php");
+      header("Location: $ssl://$url");
       exit();
     } else {
       // unsuccessful
diff --git a/config.default.php b/config.default.php
index d1eb250..a47a86f 100755
--- a/config.default.php
+++ b/config.default.php
@@ -57,14 +57,14 @@ $dbname = ""; // database name
 // (0 = no, 1 = yes)
 $require_authentication = 1;
 
+// all users tracks are visible to authenticated user
+// (0 = no, 1 = yes)
+$public_tracks = 0;
+
 // admin user who has access to all users locations
 // none if empty
 $admin_user = "";
 
-// allow automatic registration of new users
-// (0 = no, 1 = yes)
-$allow_registration = 0;
-
 // Default interval in seconds for live auto reload
 $interval = 10;
 
diff --git a/index.php b/index.php
index 46afca6..0bce681 100755
--- a/index.php
+++ b/index.php
@@ -19,7 +19,8 @@
  */
 require_once("auth.php");
 
-if ($auth && !$admin) {
+if ($auth && !$admin && !$public_tracks) {
+  // only authorized user tracks
   // get username
   $query = "SELECT login FROM users WHERE id='$auth' LIMIT 1";
   $result = $mysqli->query($query);
@@ -30,7 +31,7 @@ if ($auth && !$admin) {
   $user_form = '<u>'.$lang_user.'</u><br />'.$user.' (<a href="logout.php">'.$lang_logout.'</a>)';
 }
 else {
-  // free access or admin user
+  // public access or admin user
   // prepare user select form
   if ($admin) {
      $user = $admin_user;
@@ -71,7 +72,7 @@ $track_form = '
 <form>
 <select name="track" onchange="selectTrack(this)">';
 $userid = "";
-if ($auth && !$admin) {
+if ($auth && !$admin && !$public_tracks) {
   // display track of authenticated user
   $userid = $auth;
 } elseif ($last_id) {
@@ -124,6 +125,18 @@ $units_form = '
 </select>
 </form>
 ';
+// admin menu
+$admin_menu = '';
+$admin_script = '';
+if ($admin) {
+  $admin_menu = '
+  <div id="admin_menu">
+    <u>'.$lang_adminmenu.'</u><br />
+      <a href="javascript:void(0);" onclick="addUser()">'.$lang_adduser.'</a><br />
+  </div>
+  ';
+  $admin_script = '<script type="text/javascript" src="admin.js"></script>';
+}
 
 print
 '<!DOCTYPE html>
@@ -176,6 +189,7 @@ else {
 ';
 }
 print '
+   '.$admin_script.'
    <script type="text/javascript" src="//www.google.com/jsapi"></script>
     <script type="text/javascript">
       google.load("visualization", "1", {packages:["corechart"]});
@@ -211,6 +225,7 @@ print '
           <a href="javascript:void(0);" onclick="load(\'kml\',userid,trackid)">kml</a><br />
           <a href="javascript:void(0);" onclick="load(\'gpx\',userid,trackid)">gpx</a><br />
         </div>
+        '.$admin_menu.'
       </div>
       <div id="menu-close" onclick="toggleMenu();">»</div>
       <div id="footer"><a target="_blank" href="https://github.com/bfabiszewski/ulogger-server"><span class="mi">μ</span>logger</a> '.$version.'</div>
diff --git a/lang.php b/lang.php
index 3f8288e..bad5d89 100755
--- a/lang.php
+++ b/lang.php
@@ -53,6 +53,9 @@ switch($lang) {
     $lang_units = "Units";
     $lang_metric = "Metric";
     $lang_imperial = "Imperial/US";
+    $lang_adminmenu = "Administration";
+    $lang_adduser = "Add user";
+    $lang_userexists = "User exists";
     break;
 
   case "pl":
@@ -89,6 +92,9 @@ switch($lang) {
     $lang_units = "Jednostki";
     $lang_metric = "Metryczne";
     $lang_imperial = "Anglosaskie";
+    $lang_adminmenu = "Administracja";
+    $lang_adduser = "Dodaj użytkownika";
+    $lang_userexists = "Użytkownik istnieje";
     break;
 
     case "de":
@@ -125,6 +131,11 @@ switch($lang) {
     $lang_units = "Maßsystem";
     $lang_metric = "Metrisches";
     $lang_imperial = "Angloamerikanisches";
+    $lang_adminmenu = "Verwaltung";
+
+    // todo: translate
+    $lang_adduser = "Add user";
+    $lang_userexists = "User exists";
     break;
 
   case "hu":
@@ -161,6 +172,10 @@ switch($lang) {
     $lang_units = "Mértékegység";
     $lang_metric = "Metrikus";
     $lang_imperial = "Imperal/US";
+    $lang_adminmenu = "Adminisztráció";
+    // todo: translate
+    $lang_adduser = "Add user"; 
+    $lang_userexists = "User exists";
     break;
 }
 ?>
diff --git a/main.css b/main.css
index f7e6865..c86b255 100755
--- a/main.css
+++ b/main.css
@@ -187,3 +187,47 @@ select {
   padding-right:0.1em; 
   font-style:italic;
 }
+
+#modal {
+  display: block;
+  position: fixed;
+  z-index: 10010;
+  left: 0;
+  top: 0;
+  width: 100%;
+  height: 100%;
+  overflow: auto;
+  background-color: black; /* fallback */
+  background-color: rgba(0,0,0,0.4);
+  padding-top: 10%;
+}
+
+#modal-header {
+  top: 10px;
+  position: relative;
+  text-align: right;
+  margin: 0 auto;
+  width: 40%;
+  min-width: 300px;
+}
+
+#modal-body {
+  font-size: 0.9em;
+  font-family: Verdana, sans-serif;
+  color: white;
+  background-color: #666;
+  margin: 0 auto 15% auto;
+  border: 1px solid #888;
+  width: 40%;
+  min-width: 300px;
+  padding: 1%;
+}
+
+#modal input[type=text], #modal input[type=password] {
+  width: 100%;
+  padding: 0.4em;
+  margin: 0.8em 0;
+  display: inline-block;
+  border: 1px solid #ccc;
+  box-sizing: border-box;
+}
\ No newline at end of file