I think you need to read up on horizontal CSS List Menus, information should be in abundance on the internet.
Here's a starting point (not about horizontal lists but more general)- CSS Design: Taming Lists : http://www.alistapart.com/articles/taminglists/
To find out what ID or Class elements is in the html markup, use Firebug (firefox) or any of the inbuilt elements inspects (Chrome, Safari) to analyse the code. It's very useful and will solve most of your problems about presentation.
I took this code from the http://www.contao.org/en/installation.html page by using the browser element inspector, it's a starting point:
Code:
.mod_booknav{margin-top:1em;margin-bottom:1em;padding-top:1em;border-top:1px dotted #bbb}
.mod_booknav li{width:45%;float:left}
.mod_booknav li.up{width:10%;text-align:center}
.mod_booknav li.next{text-align:right}
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