Need code for zigzaig menu or organic menu in magento ?

yes you need a lil code .

1. create your app/code/local/Mage/Page/Block/Html/Topmenu/Custom.php
2. put inside class Mage_Page_Block_Html_Topmenu_Custom extends Mage_Page_Block_Html_Topmenu
3. copy the _getHtml() method from app/code/code/Mage/Page/Block/Html/Topmenu.php and customize it as needed
4. edit your app/design/frontend/your_theme/default/layout/page.xml and replace <block type="page/html_topmenu" name="catalog.topnav" template="page/html/topmenu.phtml"/> with<block type="page/html_topmenu_custom" name="catalog.topnav" template="page/html/topmenu.phtml"/>
5. profit!

yes you need a lil code to modify menu accordingly