function PopupCentrer(page,largeur,hauteur,options) {
   //var top=0;//(screen.height-hauteur)/2
  //var left=0;
  var top=(screen.height-hauteur)/2;
  var left=(screen.width-largeur)/2;
  window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
         
}
function affiche(td,val,img)
{
etat=val.display;
td.style.display='none';
val.display=(etat=='none')?'':'none';
if (etat=='none')
img.src="../images/puce_moin.gif";
else
img.src="../images/puce_plus.gif";
}