How do I add custom primary menu using CSS and HTML I have a Drop down mega menu using a CSS file and a HTML file.    I want to use this instead of the Drupal primary menu.   I have been advised to change the HTML in the page-header.inc file but I don't know how to do this?

On looking at the page-header.inc file, do I place the code under the file or in the header?   I have no idea! Do I have to change this section?   

&lt;?php if (isset($primary_links)) : ?&gt;
    &lt;?php print theme('links', $primary_links, array('class' =&gt; 'links primary-links')) ?&gt;
&lt;?php endif; ?&gt;


Any advice would be great, I'm new at this.
You could alter the menu attributes using template.php file and its functions exclusively for menu.