function isValidDate(dateStr,blnAcceptEmpty) {
	
	if (blnAcceptEmpty & (dateStr=='')) {
		//Empty is OK, and it is empty
		return true;
	} else {
		//Otherwise, reject it right away if it is empty...
		if (dateStr=='') return false;
	}
	 				
	var month, day, year, isLeap;

	// Checks for the following valid date formats:
	// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
	// Also separates date into month, day, and year variables

	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

	// To require a 4 digit year entry, use this line instead:
	// var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

	var matchArray = dateStr.match(datePat); // is the format ok?
	
	if (matchArray == null) {
		//alert("Date is not in a valid format.")
		return false;
	}
	month = matchArray[1]; // parse date into variables
	day = matchArray[3];
	year = matchArray[4];
	if (month < 1 || month > 12) { // check month range
		//alert("Month must be between 1 and 12.");
		return false;
	}
	if (day < 1 || day > 31) {
		//alert("Day must be between 1 and 31.");
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		//alert("Month "+month+" doesn't have 31 days!")
		return false
	}
	if (month == 2) { // check for february 29th
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day>29 || (day==29 && !isleap)) {
			//alert("February " + year + " doesn't have " + day + " days!");
			return false;
		}
	}
	return true;  // date is valid
}

function keytrapDate(fld, e) {
	var sValidChars = '0123456789/';
	var sTestString, sTestKey;
	var sTestString2, index;

	if (e.keyCode == 13) return true; // <enter> passes through.
	sTestKey = String.fromCharCode(e.keyCode );  
	
	if (sValidChars.indexOf(sTestKey) == -1 ) return false;
	
}