Parent category and subcategory of active parent category

Question

Can someone help to understand how to achieve Magento Category Navigation in header section.
Parent Category like men, women, children
and when I go with any parent category like MEN, I want to show subcategories of MEN and make it fixed for rest of its sub-subcategory child i.e. when i go with any subcategory i want to show that subcategory-set of active parent category. like in this website top category navigation : http://www.zalora.sg/

Answer 1

If you know menu file path generally it's be in header.phtml after this code
<?php echo $this->getChildHtml('topMenu') ?> then you can code something like :

    <?php
     // code goes here to get current url
    $currentUrl1 = Mage::helper('core/url')->getCurrentUrl(); 
    If($currentUrl1 == 'men'){
        echo 'My men menu html goes here ';
    }
    else If($currentUrl1 == 'women'){

    echo 'My women menu html goes here ';
    }
    else {
    echo 'My default menu html goes here ';
    }
?>

Hope this will help you.