.btn_menu{
  text-align:center;
  height:11px;
  width:100px;
  position:absolute;  
}
.btn_menu a{
  margin-right:auto;
  margin-left:auto;
  display:block;
  width:100px; 
  height:11px; 
  text-decoration: none;
  background-repeat: no-repeat;
}
.btn_menu a:hover {	
  background-position: -100px 0;	
}
.btn_menu_normal a {	
  background-position: 0 0;	
}
.btn_menu_sel a {	
  background-position: -100 0;	
}

.btn_menu_home{
  top:290px;
  left:25px;
}
.btn_menu_home a {
  background-image: url('../img/menu_home.jpg');  
}

.btn_menu_serv{
  text-align:center;
  height:11px;
  width:108px;
  position:absolute;  
  top:290px;
  left:171px;  
}
.btn_menu_serv a{
  margin-right:auto;
  margin-left:auto;
  display:block;
  width:108px; 
  height:11px; 
  text-decoration: none;
  background-repeat: no-repeat;
  background-image: url('../img/menu_service.jpg'); 
}
.btn_menu_serv a:hover {	
  background-position: -108px 0;	
}
.btn_menu_serv_normal a {	
  background-position: 0 0;	
}
.btn_menu_serv_sel a {	
  background-position: -108 0;	
}


.btn_menu_doc{
  top:290px;
  left:325px;
}

.btn_menu_doc a {
  background-image: url('../img/menu_doc.jpg');  
}

.btn_menu_liens{
  top:290px;
  left:475px;
}
.btn_menu_liens a {
  background-image: url('../img/menu_liens.jpg');  
}

.btn_menu_contact{
  top:290px;
  left:625px;
}

.btn_menu_contact a {
  background-image: url('../img/menu_contact.jpg');  
}

.logo_gsa{
  position:absolute;
  top:270px;
  left:815px;
}