var curDate = new Date();
var hEngine = 'http://www.hoteliers.com/osEngine.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()
	{
		am = document.hcomForm.am.options.selectedIndex; 
		ad = document.hcomForm.ad.options.selectedIndex; 
		dm = document.hcomForm.dm.options.selectedIndex; 
		dd = document.hcomForm.dd.options.selectedIndex;
		
		if (am > 0 && ad > 0 && dm > 0 && dd > 0)
		{
			el = document.getElementById('hoteliersdata');
			
			if (el)
			{
				document.getElementById('colLeft').style.display = 'none';
				
				el.style.display = '';
				el.innerHTML = '<iframe name="' + document.hcomForm.hTarget.value + '" src="" id="hoteliersIframe" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" width="100%" height="480px">';
			}
				document.hcomForm.target = document.hcomForm.hTarget.value;
				document.hcomForm.action = 'http://www.hoteliers.com/wlpEngine.php?ID=' + document.hcomForm.hotelID.value + '&lang=nl';
				document.hcomForm.submit();
		}
	}

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;
 }
}