.cssnav { 
position: relative;
font-family: arial, helvetica, sans-serif;
background-image: url(../SI_Button_on2.gif);
background-repeat: no-repeat;
white-space: nowrap;
display: block;
font-color: white;
width: 184px;
height: 34px;
margin: 0; 
padding: 0; 
}

.cssnav a {
display: block;
color: #FFFFFF;
font-size: 12px;
width: 184px;
height: 34px;
display: block;
float: left;
color: black;
text-decoration: none;
}

.cssnav img {width: 184px; height: 34px; border: 0; }
* html a:hover {visibility:visible}
.cssnav a:hover img{visibility:hidden}

.cssnav span {
position: absolute;
left: 5px;
top: 10px;
margin: 0px;
padding: 0px;
cursor: pointer;
}