Adding a css dynamic menu…

Hello there, I am trying to make a CSS dynamic menu

but I have 2 problems:

1) I want to add a class in classes.php at aroubnd line 588 I wrote:

if ( $cat_name=="My Main Cat 1" ||  $cat_name=="My Main Cat 2"  ||  $cat_name=="My Main Cat 3" ) {
        $link = '<a class="hide" href="' . get_category_link( $category->term_id ) . '" '; }
        else {     $link = '<a href="' . get_category_link( $category->term_id ) . '" ';}

But that isn’t really neat and the names can change:

Hox could I write:

if CATEGORIE = MAIN THEN…
ELSE …

See what I mean ?

2)
In my header i added:
<link rel="stylesheet" href="<?php bloginfo('template_directory'); ?>/css/ie7menu.css">
but strangely ul and li seem to be styled by default css

Any idea why ?

I also added a div in my sidebar:

` <div class=”deroul”>

<?php wp_list_categories(‘title_li=’); ?>

</div>`

Thanks in advance for your comments 🙂

Cotp