Hi,
for example you can put the SM2 call in a div with a class
<div class="menu"><?php show_menu2(0, SM2_ROOT, SM2_START, SM2_ALL, ' | [a][menu_title]</a>', '', '', '', '[a][menu_title]</a>'); ?></div>
so you can style the menu based on this class:
div.menu ul { ...}
div.menu li { ... }
and so on ...
Regards Bernd