Hintergrund eines Coolmenübuttons einzeln gestalten

<style type="text/css" media="screen">
<!--
/* Allgemeine Einstellungen (Schriftart, Schriftgröße...) */
body {
font-family: Verdana, sans-serif;
font-size: 14px;
overflow: auto;
padding: 10px;
margin: 0px; }

/* keine Auflistungspunkte vor Navi-Links */
ul, li {
list-style-type: none;
padding: 0px;
margin: 0px; }

/* Abstand zwischen Schrift zum Rand */
li a {
padding-right: 20px;
padding-top: 5px; }

/* Coolmenü positionieren, Werte bei "top" , "left" und "width" anpassen */
div.menu {
position: absolute;
z-index: 3;
top: 190px;
left: 100px;
width:850px; }

/* Breite der Menüpunkte einstellen */
.menu li {
width: 160px;
float: left; }

/* Aussehen der Menüpunkte einstellen */
.menu a {
border: 0px solid #000000;
background-color: #000000;
background-image: url(URL);
text-decoration: none;
text-align: center;
font-weight: bold;
cursor: pointer;
margin: 0px;
display: block;
height: 23px;
color: #00CCFF; }

/* Aussehen der Menüpunkte beim Hover Effekt */
.menu a:hover {
background-color: #00CCFF;
background-image: url(URL);
color: #000000; }

#smenu1, #smenu2, #smenu3, #smenu4, #smenu5 {
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu1 a, #smenu2 a, #smenu3 a, #smenu4 a, #smenu5 a {
font-weight: bold;
padding-top: 5px;
border-top: 0px;
cursor: pointer;
color: #FFFFFF; }
//-->
</style>

<!-- Anfang des Scriptes -->
<script type="text/javascript">
<!--
function montre(id)
{
with (document)
{
if (getElementById)
getElementById(id).style.display = 'block';
else if (all)
all[id].style.display = 'block';
else
layers[id].display = 'block';
}
}
function cache(id)
{
with (document)
{
if (getElementById)
getElementById(id).style.display = 'none';
else if (all)
all[id].style.display = 'none';
else
layers[id].display = 'none';
}
}
//-->
</script>
<!-- Ende des Scriptes -->

<div class="menu">
<li><a href="javascript:void(0);" onmouseover="montre('smenu1');" onmouseout="cache('smenu1');">Hauptmenü 1</a>
<ul id="smenu1" onmouseover="montre('smenu1');" onmouseout="cache('smenu1');">
<li><a href="Unterlink 1.1">Untermenü 1.1</a></li>
<li><a href="Unterlink 1.2">Untermenü 1.2</a></li>
<li><a href="Unterlink 1.3">Untermenü 1.3</a></li>
<li><a href="Unterlink 1.4">Untermenü 1.4</a></li>
<li><a href="Unterlink 1.5">Untermenü 1.5</a></li>
</ul>
</li>
<li><a href="javascript:void(0);" onmouseover="montre('smenu2');" onmouseout="cache('smenu2');">Hauptmenü 2</a>
<ul id="smenu2" onmouseover="montre('smenu2');" onmouseout="cache('smenu2');">
<li><a href="Unterlink 2.1">Untermenü 2.1</a></li>
<li><a href="Unterlink 2.2">Untermenü 2.2</a></li>
</ul>
</li>
<li><a href="javascript:void(0);" onmouseover="montre('smenu3');" onmouseout="cache('smenu3');">Hauptmenü 3</a>
<ul id="smenu3" onmouseover="montre('smenu3');" onmouseout="cache('smenu3');">
<li><a href="Unterlink 3.1">Untermenü 3.1</a></li>
<li><a href="Unterlink 3.2">Untermenü 3.2</a></li>
</ul>
</li>
<li><a href="javascript:void(0);" onmouseover="montre('smenu4');" onmouseout="cache('smenu4');">Hauptmenü 4</a>
<ul id="smenu4" onmouseover="montre('smenu4');" onmouseout="cache('smenu4');">
<li><a href="Unterlink 4.1">Untermenü 4.1</a></li>
<li><a href="Unterlink 4.2">Untermenü 4.2</a></li>
</ul>
</li>
<li><a href="javascript:void(0);" onmouseover="montre('smenu5');" onmouseout="cache('smenu5');">Hauptmenü 5</a>
<ul id="smenu5" onmouseover="montre('smenu5');" onmouseout="cache('smenu5');">
<li><a href="Unterlink 5.1">Untermenü 5.1</a></li>
<li><a href="Unterlink 5.2">Untermenü 5.2</a></li>
</ul>
</li>
</div>

#smenu1, #smenu2, #smenu3, #smenu4, #smenu5 {
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu1{
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu2{
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu3{
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu4{
font-size: 14px;
display: none;
width: 160px;
float: left; }

#smenu5{
font-size: 14px;
display: none;
width: 160px;
float: left; }