function validateLMOpenHouseCreation (form) {
	var viewingdate = form.viewingdate.value;
	var viewingtime = form.viewingtime.value;
	if (form.pm[0].checked) {
		pm = 0;
	} else {
		pm = 1;
	}
	if(!viewingtime.length) {
		window.alert("No time specified.");
		return false;
	} else if (!viewingdate.length) {
		window.alert("No date specified.");
		return false;
	} else if (!validTime(viewingtime) ) {
		return false;
	} else if (!validLMOpenHouseCreationDateTime(viewingdate, viewingtime, pm, form) ) {
		return false;
	} else {
		return true;
	}
}
function validLMOpenHouseCreationDateTime (dateStr, timeStr, session, form) {
	var datePat = /^(\d{4})-(\d{2})-(\d{2})/;
	var timePat = /^(\d{1,2}):(\d{2})$/;
	var matchDateArray = dateStr.match(datePat);
	var matchTimeArray = timeStr.match(timePat);
	if (matchDateArray == null) {
		window.alert("Date is not in a valid format.");
		return false;
	}
	year = Number(matchDateArray[1]);
	month = Number(matchDateArray[2]);
	day = Number(matchDateArray[3]);
	hour = Number(matchTimeArray[1]);
	minute = Number(matchTimeArray[2]);
	if (session) {
		if (hour < 12) {
			hour = hour+12;
		}
	} else {
		if (hour == 12) {
			hour == 0;
		}
	}
	var now = new Date();
	nowYear = Number(takeYear(now.getYear()));
	nowMonth = Number(now.getMonth());
	nowDay = Number(now.getDate());
	nowHour = Number(now.getHours());
	nowMinute = Number(now.getMinutes());
	if (year < nowYear) {
		window.alert ("The date you entered has passed.");
		form.viewingdate.focus();
		return false;
	} else if  ((year == nowYear) && (nowMonth > (month-1))) {
		window.alert ("The month you entered has passed.");
		form.viewingdate.focus();
		return false;
	} else if ( (year == nowYear) && (nowMonth == (month-1)) && (nowDay > day) ) {
		window.alert ("The day you entered has passed.")
		form.viewingdate.focus();
		return false;
	} else if ((year == nowYear) && (nowMonth == (month-1)) && (nowDay == day)) {
		if (nowHour > hour) {
			window.alert ("The time you entered has passed");
			form.viewingtime.focus();
			return false;
		} else if (nowHour == hour) {
			if (nowMinute > minute) {
				window.alert ("The time you entered has passed");
				form.viewingtime.focus();
				return false;
			} else if ((nowMinute - minute) < 30) {
				window.alert ("The time you entered leaves little notice.");
				form.viewingtime.focus();
				return false;
			}
		} else if (nowHour == (hour+1)) {
			if (((minute+60) - nowMinute)<30) {
				window.alert ("The time you entered leaves little notice.");
				form.viewingtime.focus();
				return false;
			}
		} else {
			if (isDate(month+"/"+day+"/"+year)) {
				return true;
			} else {
				form.viewingdate.focus();
				return false;
			}
		}
	} else {
		if (isDate(month+"/"+day+"/"+year)) {
			return true;
		} else {
			form.viewingdate.focus();
			return false;
		}
	}
}


function validate() {
	var viewingdate = document.viewingForm.viewingdate.value;
	var viewingtime = document.viewingForm.viewingtime.value;
	if (document.viewingForm.pm[0].checked) {
		pm = 0;
	} else {
		pm = 1;
	}
	if(viewingtime == "") {
		window.alert("No time specified.");
		return false;
	} else if(viewingdate == "") {
		window.alert("No date specified.");
		return false;
	} else if (!validTime(viewingtime) ) {
		return false;
	} else if (!validDateTime(viewingdate, viewingtime, pm) ) {
		return false;
	} else {
		return true;
	}
}

function validDateTime (dateStr, timeStr, session) {
	var datePat = /^(\d{4})-(\d{2})-(\d{2})/;
	var timePat = /^(\d{1,2}):(\d{2})$/;
	var matchDateArray = dateStr.match(datePat);
	var matchTimeArray = timeStr.match(timePat);
	if (matchDateArray == null) {
		window.alert("Date is not in a valid format.");
		return false;
	}
	year = Number(matchDateArray[1]);
	month = Number(matchDateArray[2]);
	day = Number(matchDateArray[3]);
	hour = Number(matchTimeArray[1]);
	minute = Number(matchTimeArray[2]);

	if (session) {
		if (hour < 12) {
			hour = hour+12;
		}
	} else {
		if (hour == 12) {
			hour == 0;
		}
	}
	var now = new Date();
	nowYear = Number(takeYear(now.getYear()));
	nowMonth = Number(now.getMonth());
	nowDay = Number(now.getDate());
	nowHour = Number(now.getHours());
	nowMinute = Number(now.getMinutes());
	if (year < nowYear) {
		window.alert ("The date you entered has passed.");
		document.viewingForm.viewingdate.focus();
		return false;
	} else if  ((year == nowYear) && (nowMonth > (month-1))) {
		window.alert ("The month you entered has passed.");
		document.viewingForm.viewingdate.focus();
		return false;
	} else if ( (year == nowYear) && (nowMonth == (month-1)) && (nowDay > day) ) {
		window.alert ("The day you entered has passed.")
		document.viewingForm.viewingdate.focus();
		return false;
	} else if ((year == nowYear) && (nowMonth == (month-1)) && (nowDay == day)) {
		if (nowHour > hour) {
			window.alert ("The time you entered has passed");
			document.viewingForm.viewingtime.focus();
			return false;
		} else if (nowHour == hour) {
			if (nowMinute > minute) {
				window.alert ("The time you entered has passed");
				document.viewingForm.viewingtime.focus();
				return false;
			} else if ((nowMinute - minute) < 30) {
				window.alert ("The time you entered leaves little notice.");
				document.viewingForm.viewingtime.focus();
				return false;
			}
		} else if (nowHour == (hour+1)) {
			if (((minute+60) - nowMinute)<30) {
				window.alert ("The time you entered leaves little notice.");
				document.viewingForm.viewingtime.focus();
				return false;
			}
		} else {
			if (isDate(month+"/"+day+"/"+year)) {
				return true;
			} else {
				document.viewingForm.viewingdate.focus();
				return false;
			}
		}
	} else {
		if (isDate(month+"/"+day+"/"+year)) {
			return true;
		} else {
			document.viewingForm.viewingdate.focus();
			return false;
		}

	}
}
function takeYear(year) {
	var y = year % 100;
	y += (y < 38) ? 2000 : 1900;
	return y;
}

function validTime(timeStr) {
	// Checks if time is in HH:MM:SS AM/PM format.
	var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
	var matchArray = timeStr.match(timePat);
	if (matchArray == null) {
		window.alert("Time is not in a valid format.");
		return false;
	}
	hour = matchArray[1];
	minute = matchArray[2];
	second = matchArray[4];
	ampm = matchArray[6];
	if (second=="") { second = null; }
	if (ampm=="") { ampm = null }
	if (hour < 1  || hour > 12) {
		window.alert("Hour must be a value between 1 and 12.")
		return false;
	}
	if (minute < 0 || minute > 59) {
		window.alert ("Minute must be between 0 and 59.");
		return false;
	}
	if (second != null) {
		window.alert ("Please do not input seconds for viewings");
		return false;
	}
	return true;
}

var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
	for (i = 0; i < s.length; i++){
		// Check that current character is number.
		var c = s.charAt(i);
		if (((c < "0") || (c > "9"))) return false;
	}
	// All characters are numbers.
	return true;
}

function stripCharsInBag(s, bag){
	var i;
	var returnString = "";
	// Search through string's characters one by one.
	// If character is not in bag, append to returnString.
	for (i = 0; i < s.length; i++){
		var c = s.charAt(i);
		if (bag.indexOf(c) == -1) returnString += c;
	}
	return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
	// EXCEPT for centurial years which are not also divisible by 400.
	return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
	}
	return this
}

function selectViewingSlot(day, time, session, slot) {
	var form = document.getElementById("viewingForm");
	form.viewingdate.value = day;
	form.viewingtime.value = time;
	if (session == 'am') {
		form.pm[0].checked = true;
	} else {
		form.pm[1].checked = true;
	}

}
function selectViewingTime(time) {
	var form = document.getElementById("viewingForm");

	if (time>=12) {
		form.pm[1].checked = true;
		if (time>12) {
			time = time-12;
		}
	} else if (time<12 || time==0) {
		form.pm[0].checked = true;
	}
	if (time<10) {
		time = "0"+time;
	}
	form.viewingtime.value = time+":00";
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
	return true
}

function expand(thistag,tag2,tag3) {
	styleObj = document.getElementById(thistag).style;
	if (styleObj.display=='none') {
		styleObj.display = '';
	} else {
		styleObj.display = 'none';
	}
	styleObj2 = document.getElementById(tag2).style;
	if (styleObj2.display=='none') {
		styleObj2.display = '';
	} else {
		styleObj2.display = 'none';
	}
	styleObj3 = document.getElementById(tag3).style;
	if (styleObj3.display=='none') {
		styleObj3.display = '';
	} else {
		styleObj3.display = 'none';
	}
}

function popUp(URL) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,width=500,height=600,left = 490,top = 262');");
}