two menues ?

[phpman]

Hi,

i have to make a modification of an existing old page transfer to GS
Now the old site has two menues "top" and "left"

If i use

<?php get_navigation(return_page_slug()); ?>

for the top menue it does not work (my css style are total crash).
If i use old structure like:

<a href="">Home</a> |<a href="/kontakt/">Kontakt</a> | <a href="/impressum/">Impressum</a>

it works. What i have to do to use
<?php get_navigation(return_page_slug()); ?>
for the main menu ?

Second point on the left i have an existing menue (like a tree)
is is possible to implement this as an extra menue in the GS too??

Hope anyone can help me.

best regards,

Harald