i have done something similar in my theme:
https://wordpress.hotserv.dk/
i use this in my header:
<div id="header">
<div id="headerimg">
<h1><a>/"><?php bloginfo('name'); ?></a></h1>
<div class="description"><?php bloginfo('description'); ?></div>
</div>
<?php //highlight 'Blog' if not Page
if (is_page()) {
$highlight = "page_item";
} else {
$highlight = "page_item current_page_item";
}
?>
<div id="supernavcontainer">
<ul id="supernav">
<li class="<?php echo $highlight; ?>"><a>">Blog</a>
<li><?php wp_list_pages('title_li='); ?></li>
</div>
and the css:
#supernavcontainer {
position: absolute;
top: 174px;
left: 50%;
width: 500px;
height: 17px;
margin: 0 0 0 -250px;
padding: 6px 0 0;
}
#supernav
{
margin: 0;
padding: 0;
width: 500px;
left: 0;
text-align: center;
color: #777;
font: bold 12px Arial, Sans-Serif;
letter-spacing: 0.07em;
display: block;
}
#supernav li
{
display: inline;
margin: 0 5px;
padding: 0;
text-transform: capitalize;
}
#supernav a
{
color: white;
text-shadow: 0 0 2px black;
padding: 5px 5px;
}
#supernav a:hover
{
background: url(/images/arrow.gif) bottom center no-repeat;
text-decoration: none;
border-bottom: none;
}
#supernavcontainer ul li a:hover {
background: url(/images/arrow.gif) bottom center no-repeat;
}
#supernav .current_page_item a {
background: url(/images/arrow.gif) bottom center no-repeat;
text-decoration: none;
}
hope that helps