if (document.images) 
{
  concept_on = new Image();
  concept_on.src = "picts/bt_concept_on.gif";  
  concept_off = new Image();
  concept_off.src = "picts/bt_concept_off.gif";

  integrale_on = new Image();
  integrale_on.src = "picts/bt_integrale_on.gif";  
  integrale_off = new Image();
  integrale_off.src = "picts/bt_integrale_off.gif";   
 
  partenaires_on = new Image();
  partenaires_on.src = "picts/bt_partenaires_on.gif";  
  partenaires_off = new Image();
  partenaires_off.src = "picts/bt_partenaires_off.gif"; 
  
  mosaiques_on = new Image();
  mosaiques_on.src = "picts/bt_mosaiques_on.gif";  
  mosaiques_off = new Image();
  mosaiques_off.src = "picts/bt_mosaiques_off.gif"; 
  
  forum_on = new Image();
  forum_on.src = "picts/bt_forum_on.gif";  
  forum_off = new Image();
  forum_off.src = "picts/bt_forum_off.gif"; 
}
function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}