Hi Nathon,
The items are AP divs set to relative positioning.
You can force it to centre, by adding a 5px margin to the first item.
<li><a href="index.asp" style="margin-left: 5px;">Home</a></li>
Alternatively, you could add 5px padding-left to your violinheaderbtns div.
#violinheaderbtns {
clear: both;
width: 980px;
margin-right: auto;
margin-left: auto;
text-align: center;
padding-left: 5px;
}