implemented hashbrown assignment.

hashbrown/includes/nav.php

@@ -0,0 +1,26 @@
+<?php
+
+function nav()
+{
+    $nav = '
+    <nav>
+        <ul>
+            <li><a href="index.php"' . ($_SERVER['SCRIPT_NAME'] == '/index.php' ? ' class="active"' : '') . '>Home</a></li>
+    ';
+
+    if (isset($_SESSION['hashbrown_access']) && $_SESSION['hashbrown_access']) {
+        $nav .= '
+            <li><a href="account.php?view=display"' . ($_SERVER['SCRIPT_NAME'] == '/account.php' ? ' class="active"' : '') . '>Account</a></li>
+            <li><a href="users.php"' . ($_SERVER['SCRIPT_NAME'] == '/users.php' ? ' class="active"' : '') . '>Users</a></li>
+            <li><a href="video.php"' . ($_SERVER['SCRIPT_NAME'] == '/video.php' ? ' class="active"' : '') . '>Video</a></li>
+            <li><a href="account.php?action=logout">Logout</a></li>
+        ';
+    }
+
+    $nav .= '
+        </ul>
+    </nav>
+    ';
+
+    return $nav;
+}