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Domineaux is right. Find that dynamenu. It has some more features than the core main menu.
To get a menu like e-xoops, you need to modify the template of that menu block.
Goto Admin, system admin, templates, list all the system blocks of the template you are using, there you find system_block_mainmenu.html. Modify this template so it views that nice picture of e-xoops in front of every menu item. Just place a
When you use dynamenu, modify the template that goes with dynamenu.
Note that you can't modify the "original" system templates. You'll have to make a clone first and use that clone as template set. (Check in the preferences which template set you use.)