function MyPopup(page,largeur,hauteur) {
  var top=(screen.height-hauteur)/2;
  var left=(screen.width-largeur)/2;
  window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+",menubar=no,scrollbars=yes,statusbar=no,toolbar=no,location=no,directories=no,resizable=no");
}

function PleinEcran(page) {
  window.open(page,"","top=0,left=0,width="+window.screen.availWidth+",height="+window.screen.availHeight+",menubar=no,scrollbars=no,statusbar=no,toolbar=no,location=no,directories=no,resizable=no");
}

function visibilite(thingId)
{
var targetElement;
targetElement = document.getElementById(thingId) ;
if (targetElement.style.display == "none")
{
targetElement.style.display = "" ;
} else {
targetElement.style.display = "none" ;
}
}