function validNumber(objval) {
	var checkString="1234567890";
	for (i =0; i < objval.length; i++) {
		if(!containsChar(objval.charAt(i),checkString))
			return false;
	}
	return true;
}

function containsChar(c,checkString) {
	for(var i = 0; i < checkString.length; i++)
		if(c == checkString.charAt(i))
			return true;
	return false;
}


function validDate(objval) {
	var checkString="1234567890/";
	if (objval.length < 10) return false;
	for (i =0; i < objval.length; i++) {
		if(!containsChar(objval.charAt(i),checkString))
			return false;
	}
	return true;
}

function validAlpha(objval) {
	var checkString="abcdefghijklmnopqrstuvwxyz'-.&, ";
	for (i =0; i < objval.length; i++) {
		if(!containsChar(objval.charAt(i),checkString))
			return false;
	}
	return true;
}

function valueExists(objval) {
	for (i =0; i < objval.length; i++) {
			if(!(objval.charAt(i)==" "))
				return true;
	}
	return false;
}

function textCounter(fieldValue, maxlimit) {
	if (fieldValue.length > maxlimit) {
    	alert("You have exceeded the maximum character limit for this field by " + (fieldValue.length - maxlimit) +
		  	  " characters. Please reduce the field size to " + maxlimit +" characters.");
		return false;
    }
	else return true;
}

function validateDates(startDateField, endDateField) {
	var error1="Start date and end date are required fields\nPlease enter a start date.";
	var error2="Start date and end date are required fields.\nPlease enter an end date.";
	var error5="An invalid start date has been entered. Please enter\na valid date in the format MM/DD/YYYY.";
	var error6="Start date is a required field. Please enter a\nstart date in the format MM/DD/YYYY."
	var error7="An invalid end date has been entered. Please enter\na valid date in the format MM/DD/YYYY.";
	var error8="End date is a required field. Please enter a\nvalid date in the format MM/DD/YYYY.";
	var error9="The end date must occur on or after the start date. Please enter\na valid end date in the format MM/DD/YYYY.";
	
	if (startDateField.value == "") {
		alert(error6);
		startDateField.focus();
		return false;
	}
	else {
		if ((!validDate(startDateField.value))||(chkdate(startDateField) == false)){
			alert(error5);
			startDateField.focus();
			return false;
		}
	}
	
	if (endDateField.value == "") {
		alert(error8);
		endDateField.focus();
		return false;
	}
	else {	
		if ((!validDate(endDateField.value))||(chkdate(endDateField) == false)){
			alert(error7);
			endDateField.focus();
			return false;
		}
	}
	
	if ((endDateField.value != "")||(startDateField.value != "")) {
		if (Date.parse(startDateField.value) > Date.parse(endDateField.value)) {
			alert(error9);
			endDateField.focus();
			return false;
		}
	}
	
	if ((endDateField.value != "")||(startDateField.value != "")) {
		if (Date.parse(startDateField.value) > Date.parse(endDateField.value)) {
			alert(error9);
			endDateField.focus();
			return false;
		}
	}
		
	return true;
}
function chkdate(objName) {
	var strDatestyle = "US"; //United States date style
	//var strDatestyle = "EU";  //European date style
	var strDate;
	var strDateArray;
	var strDay;
	var strMonth;
	var strYear;
	var intday;
	var intMonth;
	var intYear;
	var booFound = false;
	var datefield = objName;
	var strSeparatorArray = new Array("-"," ","/",".");
	var intElementNr;
	var err = 0;
	var strMonthArray = new Array(12);
	strMonthArray[0] = "Jan";
	strMonthArray[1] = "Feb";
	strMonthArray[2] = "Mar";
	strMonthArray[3] = "Apr";
	strMonthArray[4] = "May";
	strMonthArray[5] = "Jun";
	strMonthArray[6] = "Jul";
	strMonthArray[7] = "Aug";
	strMonthArray[8] = "Sep";
	strMonthArray[9] = "Oct";
	strMonthArray[10] = "Nov";
	strMonthArray[11] = "Dec";
	strDate = datefield.value;
	if (strDate.length < 1) {
		return true;
	}
	for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
		if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
			strDateArray = strDate.split(strSeparatorArray[intElementNr]);
			if (strDateArray.length != 3) {
				err = 1;
				return false;
			}
			else {
				strDay = strDateArray[0];
				strMonth = strDateArray[1];
				strYear = strDateArray[2];
			}
			booFound = true;
		}
	}
	if (booFound == false) {
		if (strDate.length>5) {
			strDay = strDate.substr(0, 2);
			strMonth = strDate.substr(2, 2);
			strYear = strDate.substr(4);
	   	}
	}
	if (strYear.length == 2) {
		strYear = '20' + strYear;
	}
	if (strDay.length != 2) {
		return false;
	}
	if (strMonth.length != 2) {
		return false;
	}
	// US style
	if (strDatestyle == "US") {
		strTemp = strDay;
		strDay = strMonth;
		strMonth = strTemp;
	}
	intday = parseInt(strDay, 10);
	if (isNaN(intday)) {
		err = 2;
		return false;
	}
	intMonth = parseInt(strMonth, 10);
	if (isNaN(intMonth)) {
		for (i = 0;i<12;i++) {
			if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
				intMonth = i+1;
				strMonth = strMonthArray[i];
				i = 12;
			}
		}
		if (isNaN(intMonth)) {
			err = 3;
			return false;
	  	}
	}
	intYear = parseInt(strYear, 10);
	if (isNaN(intYear)) {
		err = 4;
		return false;
	}
	if (intMonth>12 || intMonth<1) {
		err = 5;
		return false;
	}
	if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
		err = 6;
		return false;
	}
	if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
		err = 7;
		return false;
	}
	if (intMonth == 2) {
		if (intday < 1) {
			err = 8;
			return false;
		}
		if (LeapYear(intYear) == true) {
			if (intday > 29) {
				err = 9;
				return false;
			}
		}
		else {
			if (intday > 28) {
				err = 10;
				return false;
			}
		}
	}
	return true;
}

function LeapYear(intYear) {
	if (intYear % 100 == 0) {
		if (intYear % 400 == 0) { return true; }
		}
	else {
		if ((intYear % 4) == 0) { return true; }
	}
	return false;
}