I am using wordpress 3.3 and need the home page horizontal menu to a specific way while ALL the interior pages have a more involved drop down menu.
So, one menu for home page and all other pages get a detailed menu/

<?php include_header(); ?>
        		<?php mainmenu(); ?>
how can I make it detect if it is homepage to use mainmenu, and if not to use a secondmenu for all other pages?

I am not a programmer, more of a stylist.