[...]
<style>
[...]
  ul.Navigation_Horizontal {
    margin: 0; padding: 0em;
    text-align: center;
	width:100%;
  }
  ul.Navigation_Horizontal li {
    list-style: none;
    margin: 0; padding: 0;
	display:inline;
	line-height:30px;
  }
  ul.Navigation_Horizontal a:hover {
    border-color: white;
    border-left-color: black; border-top-color: black;
    color: white;
	background-color:#006699;
	background-image:url('btnHover.png');
  }
  ul.Navigation_Horizontal a:active {
	border: 1px solid red;
	background-color:#0066FF;
    color: #FFFFFF;
	background-image:url('btnActive.png');
	}
  ul.Navigation_Horizontal a {
	float:left; 
	width: 10%;
    text-decoration: none; font-weight: bold;
    border-left-color: white; border-top-color: white;
   	text-align:center;
    padding: 0;
    border: 1px solid black;
    border-left-color: white; border-top-color: white;
	color: #FFCC00;
	font-family: Georgia, "Times New Roman", Times, serif;
	font-size: 10px;
	text-decoration:none;
	font-weight: bold;
	background-color:#003366;
	background-image:url('btnNormal.png');
	background-repeat:repeat;
	background-position:top;
  }

#icon_home{background: url('/icons/home.jpeg') no-repeat left top;padding-left:40px;background-position:left; margin:0; }
#icon_about{background: url('/icons/about.jpg') no-repeat left top;padding-left:40px;background-position:left; margin: 0; }
[...]