// JavaScript Document
function isDateOk(dateStr) {
	var dateFormat = /^(\d{1,2})(\/)(\d{1,2})(\/)(\d{4})$/;
	var matchArray = dateStr.match(dateFormat); // is the format ok?

	if (matchArray == null) 
	{
		return false;
	}

	day = matchArray[1]; // parse date into variables
	month = matchArray[3];
	year = matchArray[5];

	if (day < 1 || day > 31) 
	{ // check day range
		return false;
	}

	if (month < 1 || month > 12) 
	{ // check month range
		return false;
	}

	if (year < 1950 || year > 2008) 
	{ // check year range
		return false;
	}

	if ((month == 4 || month == 6 || month == 9 || month == 11) && day == 31) 
	{
		return false;
	}

	if (month == 2) 
	{ // check for february 29th
		var isLeapYear = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day > 29 || (day == 29 && !isLeapYear)) 
		{
			return false;
		}
	}
	return true; // date is valid
}