function checkdate(objName, dateName) {
	dateObj = MM_findObj(objName);
	if (chkdate(dateObj) == false) {
		alert("Invalid " + dateName + " entered.  Please try again.");
		dateObj.value = "";
		return false;
	} else {
		return true;
	}
}

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

function chkdate(objName) {
	var datefield = objName;
	var strDate = datefield.value;
	var strDay; var strMonth; var strYear;
	var intDay; var intMonth; var intYear;
	var strSeparatorArray = new Array("-"," ","/",".");
	var booFound = false;
	var strDateArray;
	var err = 0;
	// field empty validate
	if (strDate.length < 1) { 
		return true; 
	}
	// get month, day, and year with seperators
	for (i = 0; i < strSeparatorArray.length; i++) {
		if (strDate.indexOf(strSeparatorArray[i]) != -1) {
			strDateArray = strDate.split(strSeparatorArray[i]);
			if (strDateArray.length != 3) {
				return false;
			} else {
				strMonth = strDateArray[0];
				strDay = strDateArray[1];
				strYear = strDateArray[2];
			}
			booFound = true;
   		}
	}
	// get month, day, and year without seperators
	if (booFound == false) {
		if (strDate.length > 5) {
			strMonth = strDate.substr(0, 2);
			strDay = strDate.substr(2, 2);
			strYear = strDate.substr(4);
   		}
	}
	// add 20 to year if 2 digit entered
	if (strYear.length == 2) {
		strYear = '20' + strYear;
	}
	// check month for number format
	intMonth = parseInt(strMonth, 10);
	if (isNaN(intMonth)) {
		return false;
	}	
	// check day for number format
	intDay = parseInt(strDay, 10);
	if (isNaN(intDay)) {
		return false;
	}
	// check year for number format
	intYear = parseInt(strYear, 10);
	if (isNaN(intYear)) {
		return false;
	}
	// check for valid months
	if (intMonth < 1 || intMonth > 12) {
		return false; 
	}
	// validate months with 31 days	
	if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intDay < 1 || intDay > 31)) { 
		return false; 
	}
	// validate months with 30 days	
	if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intDay < 1 || intDay > 30)) {
		return false; 
	}
	// validate feb with LeapYear
	if (intMonth == 2) {
		if (intDay < 1) { return false; }
		if (LeapYear(intYear) == true) {
			if (intDay > 29) { return false; }
		} else {
			if (intDay > 28) { return false; }
		}
	}
	datefield.value = intMonth + "/" + intDay + "/" + strYear;
	return true;
}