their css is effecting every instance of the tags; they're pretty common tags. I'd take and do:

Header Insert
Code
<style type="text/css">
#navigation ul {
list-style-type:none;
margin:0;
padding:0;
overflow:hidden;
}
#navigation li {
float:left;
}
#navigation a:link,a:visited {
display:block;
width:120px;
font-weight:bold;
color:#FFFFFF;
background-color:#98bf21;
text-align:center;
padding:4px;
text-decoration:none;
text-transform:uppercase;
}
#navigation a:hover,a:active {
background-color:#7A991A;
}

</style>

Default Header
Code
<div id="navigation">
<ul>
<li><a href="#home">Home</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
</ul>
</div>

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