function book_test(formulaire) {
var message='';
var todaydate=new Date();
var today=new Date(todaydate.getFullYear(),todaydate.getMonth(), todaydate.getDate());
choixdate=new Date(formulaire.FirstSelectMonth.options[formulaire.FirstSelectMonth.selectedIndex].value.substring(0,4), eval(formulaire.FirstSelectMonth.options[formulaire.FirstSelectMonth.selectedIndex].value.substring(4,6))-1, formulaire.FirstSelectDay.options[formulaire.FirstSelectDay.selectedIndex].value);
if (today<=choixdate) { } else {message='Invalid date - Date invalide.'};
if (message!='') alert(message);
else
{
 formulaire.target="_blank";
 formulaire.submit();
}
}

function setCurrentDate() {
  var currentDate = new Date();
  setDays();
  document.PW.FirstSelectDay.selectedIndex = currentDate.getDate() - 1;
   var mois = currentDate.getMonth()+1;
   var annee = currentDate.getFullYear();
   if( mois < 10)
     mois ="0"+ mois;
   var i;
   var anneemois = annee + "" +  mois;
   for( i = 0; i < document.PW.FirstSelectMonth.length; i++)
   {
	   if(document.PW.FirstSelectMonth.options[i].value == anneemois)
	   {
			document.PW.FirstSelectMonth.options[i].selected = true;
			break;
		}
   }
}

function setDays() {

  var Monthlong = document.PW.FirstSelectMonth.options[document.PW.FirstSelectMonth.selectedIndex].value;
  var m=Monthlong.substring(4,6);
  var y=eval(Monthlong.substring(0,4));

  days = 31;
  if ( (m == "04") || (m == "06") || (m == "09") || (m == "11") ) {
    days = 30;
  }
  else if (m == "02") {
    // check for leapyear - Any year divisible by 4, except those divisible by 100 (but NOT 400)
    if ( (Math.floor(y/4) == (y/4)) && ((Math.floor(y/100) != (y/100)) || (Math.floor(y/400) == (y/400))) )
      days = 29;
    else
      days = 28;
  }

  // if (days in new month > current days) then we must add the extra days
  if (days > document.PW.FirstSelectDay.length) {
    for (i = document.PW.FirstSelectDay.length; i < days; i++) {
      document.PW.FirstSelectDay.length = days;
      document.PW.FirstSelectDay.options[i].text = i + 1;
      document.PW.FirstSelectDay.options[i].value = i + 1;
    }
  }
  
  // if (days in new month < current days) then we must delete the extra days
  if (days < document.PW.FirstSelectDay.length) {
    document.PW.FirstSelectDay.length = days;
    if (document.PW.FirstSelectDay.selectedIndex == -1) 
      document.PW.FirstSelectDay.selectedIndex = days - 1;
  }
}