Centering my horizontal menu & hearder logo

Hi people,

I am very new to wordpress, so sorry for the dumb question.

This is my blog: productlove.net

my question is this, how do i get my horizontal menu centred under my header logo. So far I have this for my horizontal menu:

#navmenu ul {margin: 0; text-align:center;
list-style-type: none; list-style-image: none; width:auto; }
#navmenu li {display: inline; padding: 5px 50px 5px 50px }
#navmenu ul {margin-bottom: 50px;}
#navmenu a {text-decoration:none; color: blue; }
#navmenu a:hover {color: purple; }

Any help would be wonderful!