I also want to include home button at the first position of top main navigation.
The easiest way is to edit the template
app/design/frontend/base/default/template/page/html/topmenu.phtml and add a
li element with a link to the homepage.
<ul id="nav"> <?php echo $_menu ?> </ul>
<ul id="nav"> <li class="home"><a href="<?php echo Mage::getUrl('')?>"><?php echo $this->__('Home')?></a></li> <?php echo $_menu ?> </ul>
But this means it will be available only for your current theme.
If you want it to be available independent of the theme you can use the
And example on how to use that can be found here: Adding links to category menu