a.bouton:link{
width:120px; 
height:23px; 
line-height: 23px;
text-decoration:none; 
color:black;
text-align:center; 
font-weight:bold; 
font-family: Arial, Helvetica, sans-serif;
font-size: small;
background-image:url(NavOff.jpg);
padding:0px;
}

a.bouton:visited{
width:120px; 
height:23px;
text-decoration:none; 
color:black;
text-align:center; 
font-weight:bold; 
font-family: Arial, Helvetica, sans-serif;
font-size: small;
background-image:url(NavOff.jpg);
padding:0px}

a.bouton:hover{
width:120px; 
height:23px; 
text-decoration:none;
color:black; 
text-align:center; 
font-weight:bold; 
font-family: Arial, Helvetica, sans-serif;
font-size: small;
background-image:url(NavOn.jpg);
padding:0px;
}

.bouton{text-align:center;padding:0px 0px; width: 120px; height: 23px;display: block;
}