What i did for mine was simple, first, look at the navbar code for the menu.
then do something like this:
<table>
<tr>
<td><!--- VB code for the first menu item ---></td>
<td><!--- VB code for the second menu item ---></td>
<td><!--- VB code for the third menu item ---></td>
<td><!--- VB code for the fourth menu item ---></td>
<td><!--- VB code for the fifth menu item ---></td>
</tr>
<table>
Of course, you would apply any class identifiers and element properties needed to the code to suit your design. and would put that table into a row in your header under or over your banner depending where you uwant it.
If you wanted a custom navbar in your header, the the same thign applies except you put whatever links you want instead of the VB code for the links.