diff --git a/www/assets/componets/header.php b/www/assets/componets/header.php
index 7775fe2..8c30342 100644
--- a/www/assets/componets/header.php
+++ b/www/assets/componets/header.php
@@ -1,8 +1,9 @@
 
 <header>
-<ul>
-    <li><a href="">molestie honestatis error</a> </li>
-    <li><a href="">tempus ex petentium</a> </li>
-    <li><a href="">est cursus dictas</a> </li>
-</ul>
+    <nav><ul>
+    <li><a href="index.php">Úvodní strana</a> </li>
+    <li><a href="zaci.php">Seznam žáků</a> </li>
+    <li><a href="pridat-zaka.php">Přidat žáka</a> </li>
+</ul></nav>
+
 </header>
diff --git a/www2databaze/assets/header.php b/www2databaze/assets/header.php
index ccd1c5e..b16cbfd 100644
--- a/www2databaze/assets/header.php
+++ b/www2databaze/assets/header.php
@@ -1,3 +1,7 @@
 <header>
-    <h1>Hlavička</h1>
+<nav><ul>
+    <li><a href="index.php">Úvodní strana</a> </li>
+    <li><a href="zaci.php">Seznam žáků</a> </li>
+    <li><a href="pridat-zaka.php">Přidat žáka</a> </li>
+</ul></nav>
 </header>
\ No newline at end of file
diff --git a/www2databaze/assets/zak.php b/www2databaze/assets/zak.php
new file mode 100644
index 0000000..8e9412f
--- /dev/null
+++ b/www2databaze/assets/zak.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Získá jednoho žáka z databáze podle id
+ * 
+ * @param object $connection - připojení k databázi
+ * @param integer $id - id žáka
+ * 
+ * @return mixed asociativní pole, které obsahuje informace o jednom konkrétním žákovi nebo vrátí null, pokud žák nebyl nalezen
+ * 
+ */
+function getStudent($connection, $id){
+    $sql = "SELECT * FROM student WHERE id = ?";
+
+    $stmt = mysqli_prepare($connection, $sql);
+
+    if ($stmt === false) {
+        echo mysqli_error($connection);
+    } else {
+        mysqli_stmt_bind_param($stmt, "i", $id);
+        if (mysqli_stmt_execute($stmt)) {
+            $result = mysqli_stmt_get_result($stmt);
+            return mysqli_fetch_array($result, MYSQLI_ASSOC);
+        }
+    }
+}
diff --git a/www2databaze/jeden-zak.php b/www2databaze/jeden-zak.php
index ea3521c..08541ce 100644
--- a/www2databaze/jeden-zak.php
+++ b/www2databaze/jeden-zak.php
@@ -2,18 +2,12 @@
 global $connection;
 
 require "assets/database.php";
+require "assets/zak.php";
 
 $connection = connectionDB();
 
 if (isset($_GET["id"]) and is_numeric($_GET["id"])) {
-    $sql = "SELECT * FROM student WHERE id = ". $_GET["id"];
-
-    $result = mysqli_query($connection, $sql);
-    if ($result === false) {
-        echo mysgli_error($connection);
-    } else {
-        $students = mysqli_fetch_assoc($result);
-    }
+    $students = getStudent($connection, $_GET["id"]);
 }