Untitled

<head>
    <script src="libraries/jquery-1.11.1.min.js"></script>
    <script type="text/javascript" src="models/scripts/bridge.js"></script>
    <script src="js/product.js"></script>
</head>

<header id="header">
     <?php require("_menu.php"); ?>
</header>

<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.1.min.js"></script>