<nav class="mobile-menu">
    <label for="show-menu" class="show-menu"><span>Menu</span><div class="lines"></div></label>
    <input type="checkbox" id="show-menu">
    <ul id="menu">
    <li><a href="index.php">选课主页</a></li>
        <li><a href="Courselib.php">课程库</a></li>
        <li><a href="PInformation.php">我的信息</a></li>
        <!--<li><a href="../shoppingcart/index.php">翱翔购物中心</a></li>-->
    </ul>
</nav>
<nav class="pic-menu">
    <img src="img/campus_anthem.jpg">
    <?php
        if (isset($_COOKIE["username"]) == False){
            echo "<a href='Login.php'>登录 注册</a>";
    }else{
    echo "<a href='Login.php'>{$_COOKIE["username"]},已登录</a>";

    }    ?>
</nav>