引导导航不切换;.php文件在单独的文件夹中

我正在使用引导程序创建一个响应式网站，当屏幕尺寸很小时，我的导航栏切换按钮出现问题......

当我的所有.php文件都在同一个目录(根目录(中时，该按钮工作正常;但是我只是更改了它，以便所有.php文件现在都在各自的文件夹中，(联系人.php现在是联系人/索引.php等(以创建更干净的URL。这导致切换按钮在单击时不再切换。

我的导航代码如下; 任何见解将不胜感激，谢谢！

<!-- NAVIGATION -->
  <div class="navbar navbar-default" role="navigation">
    <div class="navbar-inner">
      <div class="container inner-container">
        <div class="navbar-header">
          <a href="index.php" class="navbar-brand"><img src="../img/index/skytek-logo/Skytek_c1_S.png" width="160px" height="90px" alt="Skytek Logo"></a><p class="navbar-slogan">Dedicated to excellence in innovation and service</p>
          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#nav-collapse">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
        </div>
          <div class="collapse navbar-collapse" id="nav-collapse">
              <ul class="nav navbar-nav">
                 <?php
                  /* list items with a class of "active" indicate the current section;
                   * the $section variable is set in each individual file
                   */
                 ?>
                 <li class="home <?php if ($section == "home") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>">Home</a></li>
                 <li class="about <?php if ($section == "about") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>about/">About Us</a></li>
                 <li class="support <?php if ($section == "support") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>services/">Support &amp; Services</a></li>
                 <li class="sales <?php if ($section == "sales") { echo "active"; } ?>"><a href="#" style="color: #AAA;">Sales</a></li>
                 <li class="news <?php if ($section == "news") { echo "active"; } ?>"><a href="#" style="color: #AAA;">News</a></li>
                 <li class="contact <?php if ($section == "contact") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>contact/">Contact</a></li>
                 <li class="careers <?php if ($section == "careers") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>careers/">Careers</a></li>
                 <li class="staff <?php if ($section == "staff") { echo "active"; } ?>"><a href="<?php echo BASE_URL; ?>staff/">Staff Zone</a></li>
              </ul>  
          </div>
        </div>
      </div>
    </div>
<!-- END NAVIGATION -->