function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_changeProp(objName,x,theProp,theValue) { //v6.0
  var obj = MM_findObj(objName);
  if (obj && (theProp.indexOf("style.")==-1 || obj.style)){
    if (theValue == true || theValue == false)
      eval("obj."+theProp+"="+theValue);
    else eval("obj."+theProp+"='"+theValue+"'");
  }
}

var startDate;
		var endDate;
		function resetDates() {
			startDate = endDate  = null;
		}

		function filterDates1(cal) {
			startDate = new Date(cal.date)
			startDate.setHours(0,0,0,0)	// used for compares without TIME
			/* If they haven't chosen an 
			end date before we'll set it to the same date as the start date This
			way if the user scrolls in the start date 5 months forward, they don't
			need to do it again for the end date.
			*/

			if (endDate == null) { 
				Zapatec.Calendar.setup({
					inputField     :    "DateOut",
					button         :    "buttonDep",  // What will trigger the popup of the calendar
					ifFormat       :    "%d, %B, %Y",     // format of the input field
					date           :     cal.date,
					showsTime      :     false,          //no time
					dateStatusFunc		:    disallowDateBefore, //the function to call
					onUpdate       :    filterDates2
				});
			}
			MM_changeProp('SelectLength','','selectedIndex', daysElapsed(startDate,endDate),'SELECT');			
		}

		function filterDates2(cal) {
			var date = cal.date;
			endDate = new Date(cal.date)
			endDate.setHours(0,0,0,0)	// used for compares without TIME
			//var SelectLength = document.getElementById("SelectLength");
			MM_changeProp('SelectLength','','selectedIndex', daysElapsed(startDate,endDate),'SELECT');
		}

		/*
		* This functions return true to disallow a date
		* and false to allow it.
		*/


		/* 
		* Check-Out calendar allowed dates
		* Check-Out date can not be BEFORE Check-In date
		* Check-Out date can not be before today
		*/
		function disallowDateBefore(dateCheckOut) {
			dateCheckOut.setHours(0,0,0,0)
			if ((startDate != null) && startDate > dateCheckOut)
				// startDate is defined, make sure cal date is NOT before start date
				return true; 
			
			var now = new Date()
			now.setHours(0,0,0,0)
			if (dateCheckOut < now) 
				// check out date can not be befor today if startDate NOT defined
				return true;

			return false;
		}

		/* 
		* Check-In date checking
		* Check-In date can not be AFTER Check-Out date
		* Check-In date can not be before today
		*/
		function disallowDateAfter(dateCheckIn) {
			dateCheckIn.setHours(0,0,0,0)
			if ((endDate != null) && dateCheckIn > endDate)
				// endDate defined, calendar date can NOT be after endDate
				return true;

			var now = new Date()
			now.setHours(0,0,0,0)

			if (dateCheckIn < now)
				// endDate NOT defined, calendar date can not be before today
				return true;

			return false;
		}


function y2k(number) { return (number < 1000) ? number + 1900 : number; }

function daysElapsed(date1,date2) {	
	if(date2==undefined){
		return;
	}else{
		var difference = Date.UTC(y2k(date2.getYear()),date2.getMonth(),date2.getDate(),0,0,0) - Date.UTC(y2k(date1.getYear()),date1.getMonth(),date1.getDate(),0,0,0);
	}
    
    return difference/1000/60/60/24-1;
}