a.bouton:link{
width:150px; 
height:30px; 
text-decoration:none; 
color:white;
text-align:center; 
font-weight:bold; 
background-image:url(img1a.jpg);
padding:5px}

a.bouton:visited{
width:150px; 
height:30px;
text-decoration:none; 
color:white; 
text-align:center;
font-weight:bold;
background-image:url(img1a.jpg);
padding:5px}

a.bouton:hover{
width:150px; 
height:30px; 
text-decoration:none;
color:white; 
text-align:center; 
font-weight:bold; 
background-image:url(img1b.jpg);
padding:5px}

.bouton{text-align:center;padding:5px;}



a.bouton2:link{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img2a.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

a.bouton2:visited{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img2a.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

a.bouton2:hover{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img2b.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

.bouton2{text-align:center;padding:5px;}

a.bouton3:link{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img3a.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

a.bouton3:visited{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img3a.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

a.bouton3:hover{
width:150px;
height:30px;
text-decoration:none;
color:white;
text-align:center;
font-weight:bold;
background-image:url(img3b.jpg);
padding:5px;
border-style:outset;
border-width:2px;
border-color:silver}

.bouton3{text-align:center;padding:5px;}