IF you want to show Selected category to the top navigation

Go to
/app/design/frontend/default/YOURTHEMENAME/template/catalog/navigation/top.phtml

The original contents of the top.phtml file should look like below.


<?php $_menu = $this->renderCategoriesMenuHtml(0,'level-top') ?>
<?php if($_menu): ?>
<div class="nav-container">
    <ul id="nav">
        <?php echo $_menu ?>
    </ul>
</div>
<?php endif ?>

Replace the code above with this code below.


<?php $_menu = ''?>
<?php foreach ($this->getStoreCategories() as $_category): ?>
    <?php $_menu .= $this->drawItem($_category) ?>
<?php endforeach ?>
<?php if ($_menu): ?>
<div class="nav-container">
    <ul id="nav">
    <?php foreach ($this->getStoreCategories() as $_category): ?>
    <?php if (in_array($_category->getId(), array(10,12,15))) : ?> <?php echo $this->drawItem($_category) ?>
    <?php endif; ?>
    <?php endforeach ?>
    </ul>
</div>
<?php endif; ?>


10,12,15 is the category id which you want to display in the navigation.