Magento Category tree navigation

magento-category-navigation.phtml

<?php
$categories = Mage::getModel('catalog/category')->load(1)->getChildren();
$categoryIDs = explode(',',$categories);
?>
<ul>
<?php foreach($categoryIDs as $categoryID): ?>
	<li>
    	<?php $category = Mage::getModel('catalog/category')->load($categoryID);?>
                <a href="<?php echo $category->getUrl()?>">
	                <?php echo $category->getName()?>
                </a>

		<?php $subCategories = Mage::getModel('catalog/category')->load($category->getId())->getChildren();
			$subCategoryIDs = explode(',',$subCategories);?>

            <?php if(count($subCategoryIDs) > 1):?>
                <ul>
                <?php foreach($subCategoryIDs as $subCat) :?>
                    <li>
                    <?php $subCategory = Mage::getModel('catalog/category')->load($subCat); ?>
                        <a href="<?php echo $subCategory->getUrl()?>">
	                        <?php echo $subCategory->getName()?>
                        </a>

                    </li>
                <?php endforeach;?>
                </ul>
            <?php endif; ?>
    </li>
<?php endforeach; ?>
</ul>