$(function(){
  $("#admin #centre #panneau_admin img").mouseover(
    function(){
      var url = "images/admin/bouton_"+$(this).attr("alt")+"_on.png";
      $(this).attr("src",url);
;
    }
  )
  $("#admin #centre #panneau_admin img").mouseout(
    function(){
      var url = "images/admin/bouton_"+$(this).attr("alt")+"_off.png";
      $(this).attr("src",url);
    }
  )
});