function isUnderConstruction() {
  var dateDebut = new Date("July 29, 2007 09:00:00");
  var dateFin = new Date("July 29, 2007 14:30:00");
  var aujourdhui = new Date();

  return (Date.parse(aujourdhui) >= Date.parse(dateDebut) && Date.parse(aujourdhui) <= Date.parse(dateFin));

}

function isUnderConstructionGrande() {

  var dateDebut = new Date("July 29, 2007 09:00:00");
  var dateFin = new Date("July 29, 2007 14:30:00");
  var aujourdhui = new Date();
  
  return (Date.parse(aujourdhui) >= Date.parse(dateDebut) && Date.parse(aujourdhui) <= Date.parse(dateFin));

}