function recadre(){
  if (! window.ActiveXObject)
    return;
  var ids=["mm","mg","mmfond","mmfiltre","md"];
  var h=document.getElementById("hg").clientHeight;
  var b=document.getElementById("b").clientHeight;
  var hauteur=document.body.clientHeight-30-h-b;
  var i, elem;
  for (i=1 ; i<ids.length ; i++) {
    elem=document.getElementById(ids[i]);
    elem.style.height=hauteur;
  }
  elem=document.getElementById(ids[0]);
  elem.style.height=hauteur-18;
}  

function vaEtVient(id){
  var id=document.getElementById(id);
  if (id.style.display=="none")
    id.style.display="block";
  else
    id.style.display="none";
}