common_navbar.html

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand"><span class="glyphicon glyphicon-apple"></span></a>
    </div>
    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li id="profile_header"><a href="welcome.php">Profile</a></li>
        <li id="friendList_header"><a href="FriendList.php">Friend list</a></li>
        <li id="friendInvitation_header"><a href="friend_invitation.php">Friend invitation</a></li>
        <li id="selectedFriends_header"><a href="select_friends.php">Create friend circle</a></li>
        <li id="chatRoom_header"><a href="chat_room.php">Chat room</a></li>
        <li id="chatRoom_header"><a href="blog.php">Blog</a></li>
        <li id="chatRoom_header"><a href="allCollections.php">Photo Collections</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="logout.php"><span class="glyphicon glyphicon-log-in"></span> Log out</a></li>
      </ul>
    </div>
  </div>
</nav>