You could use jQuery Image Dropdown:
http://marghoobsuleman.com/jquery-image-dropdown
(source: marghoobsuleman.com)
<script language="javascript">
$(document).ready(function(e) {
try {
// target some ids
MSDropDown.init("#combo1, #combo2");
//by wild card
MSDropDown.init("#divid select");
//or
MSDropDown.init("#formid select");
} catch(e) {
alert(e);
}
})
</script>