Here's the easy way:
Add a new template in the skin1 directory...call it site_map.tpl. Use this code in it:
Code:
{capture name=menu}
Link 1
Link 2
Link 3
Link 4
{/capture}
{ include file="menu.tpl" dingbats="dingbats_categorie.gif" menu_title=title menu_content=$smarty.capture.menu }
Replace the links with your links and replace the =title with the menu title of your choice.
Then call the template from customer/home.tpl wherever you want it by using this code:
{include file="site_map.tpl"}
It won't be 'expandable' but it will do the trick.