/*
Copyright (C)2002 by Henrik Gustafsson
All rights reserved.
*/

var daysOfMonth = new Array
(
  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
);

var daysOfMonthLY = new Array
(
  31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
);

function isLeapYear(year)
{
  year = year - 0;
  if ((year/4)   != Math.floor(year/4))
  	return false;

  if ((year/100) != Math.floor(year/100))
  	return true;

  if ((year/400) != Math.floor(year/400))
  	return false;

  return true;
}

function isValidDate(day, month, year)
{
  day = day - 0; month = month - 0; year = year - 0;
  if ((isLeapYear(year) && day > daysOfMonthLY[month-1]) ||
     (!isLeapYear(year) && day > daysOfMonth[month-1]))
    return false;
  else
    return true;
}