var curDate = new Date();
var hEngine = 'http://www.hoteliers.com/wlpEngine.php?ID='; 

function dInM(mon)
	{           
		if (mon == 2)
			{
			 Year = curDate.getFullYear();
			 if(Math.round(Year/4) == Year/4)
				{
					if(Math.round(Year/100) == Year/100)
					{
						if(Math.round(Year/400) == Year/400)
						return 29;
						else return 28;
					}
				else return 29;
				}
			return 28;
			}
			else if (mon == 4 || mon == 6 || mon == 9 || mon == 11)
			{
			 return 30;
			}
			return 31;
	}

function getNDay()
{
theMonth = document.hcomForm.am.options.selectedIndex;
theDay = parseInt(document.hcomForm.ad.options.selectedIndex);

 if (! theMonth == 0 && ! theDay == 0)
 {
  dInMonth = dInM(theMonth);
  
  if (theDay > dInMonth)
  {
	document.hcomForm.ad.options.selectedIndex = theDay = dInMonth;
  }
  newDay = theDay + 1;
  newMonth = theMonth;
  
  if (newDay > dInMonth)
  {
			newDay = 1;
			newMonth = theMonth + 1;
			if (newMonth > 12)
			{
				newMonth = 1;
			}
  }

document.hcomForm.dd.selectedIndex = newDay;
document.hcomForm.dm.selectedIndex = newMonth;
 }
}

function doCheckForm(lang)
{
scroll(0,0);
$('body').addClassName('noscroll');
document.hcomForm.target = document.hcomForm.hTarget.value;
document.hcomForm.action = 'http://www.hoteliers.com/wlpEngine.php?ID=' + document.hcomForm.hotelID.value + '&lang=' + lang;
document.hcomForm.submit();
$('boekingsmodule').style.display = 'block';
}

function checkDDate()
{
 theMonth = document.hcomForm.dm.options.selectedIndex;
 theDay = parseInt(document.hcomForm.dd.options.selectedIndex);
 dInMonth = dInM(theMonth);
 
 if (theDay > dInMonth)
 {
  document.hcomForm.dd.options.selectedIndex = theDay = dInMonth;
 }
}