a.p{
  display:block;
  height:18px;
  width:105px;
  background-image: url(../../img/NAV-FR-retour.gif);
  background-repeat: no-repeat;
  float:left;
}
a.s{
  display:block;
  height:18px;
  width:105px;
  background-image: url(../../img/NAV-FR-continue.gif);
  background-repeat: no-repeat;
  float:right;
}
#fleche_navigation{
  position:relative;
  left:-18px;
  width:836px;
}
#fleche_navigation a:hover{
  background-position: center -18px;
}