seite zeigt es nicht an

li.nav_element a:hover{
color:#FF0000;
display: block;
margin: 5px;
padding-left: 10px;
text-decoration: none;
width: 120px;
height: 20px;
background-image:url();
background-color:#FF0000 ;}

li.nav_element a{
color:#FFFFFF;
display: block;
margin: 5px;
padding-left: 10px;
text-decoration: none;
width: 120px;
height: 20px;
background-image:url();
background-color:#FFFFFF;}