List magento categories and subcategories in different way.

Display Top Level Categories Only
<?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>
<?php endforeach; ?>
</ul>
<?php endif; ?>
Display Top Level Categories and ALL Subcategories
<?php $_helper = Mage::helper(‘catalog/category’) ?>
<?php $_categories = $_helper->getStoreCategories() ?>
<?php $currentCategory = Mage::registry(‘current_category’) ?>
<?php if (count($_categories) > 0): ?>
<ul>
<?php foreach($_categories as $_category): ?>
<li>
<a href=”<?php echo $_helper->getCategoryUrl($_category) ?>”>
<?php echo $_category->getName() ?>
</a>
<?php $_category = Mage::getModel(‘catalog/category’)->load($_category->getId()) ?>
<?php $_subcategories = $_category->getChildrenCategories() ?>
<?php if (count($_subcategories) > 0): ?>
<ul>
<?php foreach($_subcategories as $_subcategory): ?>
<li>
<a href=”<?php echo $_helper->getCategoryUrl($_subcategory) ?>”>
<?php echo $_subcategory->getName() ?>
</a>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
Display Top Level Categories and Current Categories SubCategories
<?php $_helper = Mage::helper(‘catalog/category’) ?>
<?php $_categories = $_helper->getStoreCategories() ?>
<?php $currentCategory = Mage::registry(‘current_category’) ?>
<?php if (count($_categories) > 0): ?>
<ul>
<?php foreach($_categories as $_category): ?>
<li>
<a href=”<?php echo $_helper->getCategoryUrl($_category) ?>”>
<?php echo $_category->getName() ?>
</a>
<?php if ($currentCategory &amp;&amp; $currentCategory->getId() == $_category->getId()): ?>
<?php $_category = Mage::getModel(‘catalog/category’)->load($_category->getId()) ?>
<?php $_subcategories = $_category->getChildrenCategories() ?>
<?php if (count($_subcategories) > 0): ?>
<ul>
<?php foreach($_subcategories as $_subcategory): ?>
<li>
<a href=”<?php echo $_helper->getCategoryUrl($_subcategory) ?>”>
<?php echo $_subcategory->getName() ?>
</a>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<?php endif; ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>