.pre a:link, .pre a:visited{
width:99px;
height:36px;
text-decoration:none;
background-image:url(Images/pre_bl.gif);
float:left;
}

.pre a:hover{
background-image:url(Images/pre_v.gif);
}

.sommaire a:link, .sommaire a:visited{
width:99px; 
height:36px;
text-decoration:none;
background-image:url(Images/som_b.gif);
float:left;
}

.sommaire a:hover{
background-image:url(Images/som_v.gif);
}

.rec a:link, .rec a:visited{
width:99px; 
height:36px;
text-decoration:none;
background-image:url(Images/rec_j.gif);
float:left;
}

.rec a:hover{
background-image:url(Images/rec_v.gif);
}

.alpha a:link, .alpha a:visited{
width:99px; 
height:36px;
text-decoration:none;
background-image:url(Images/alpha_bl.gif);
float:left;
}

.alpha a:hover{
background-image:url(Images/alpha_v.gif);
}

.mot a:link, .mot a:visited{
width:99px; 
height:36px;
text-decoration:none;
background-image:url(Images/mot_b.gif);
float:left;
}

.mot a:hover{
background-image:url(Images/mot_v.gif);
}

.sui a:link, .sui a:visited{
width:99px; 
height:36px;
text-decoration:none;
background-image:url(Images/sui_j.gif);
float:left;
}

.sui a:hover{
background-image:url(Images/sui_v.gif);
}