Magento Helper

<?php $_helper = Mage::helper( 'catalog/category' ) ?> <?php $_categories = $_helper ->getStoreCategories() ?> <?php if ( count ( $_categories ) > 0): ?>      <ul>          <?php foreach ( $_categories as $_category ): ?>              <li>                  <a href= "<?php echo $_helper->getCategoryUrl($_category) ?>" >                      <?php echo $_category ->getName() ?>                  </a>              </li>      ...