/*
NAME:		p72isDate()
AUTHOR:	 Chris Hembrow [ chris at pixelseventy2 dot net ]
CREATED:	jan2004
DESCRIPTION: validates a given date ( returns a boolean )
				 can also validate that a date is in the past

PARAMS:		p72day - Integer - the day of the month
				p72month - Integer - the month
				p72year - Integer - the year
				p72noFuture [optional] - boolean - false allows future dates, true prevents them
*/

function p72isDate(p72day,p72month,p72year,p72noFuture) {
  if ( p72day <= 0 || p72month <= 0 || p72year <= 0 ) return false;
  if ( p72day > 31 || p72month > 12 ) return false;
  if ( p72day == 31 && ( p72month == 4 || p72month == 6 || p72month == 9 || p72month == 11 ) ) return false;
  var p72isLeap = ( p72year % 4 == 0 && ( p72year % 100 != 0 || p72year % 400 == 0 ) )
  if ( p72month == 2 && ( p72day > 29 || ( p72day > 28 && !p72isLeap ) ) ) return false;
  if ( p72noFuture ) {
	 d1 = new Date();
	 d2 = new Date( p72year , p72month-1 , p72day );
	 if ( d2 > d1 ) return false;
  }
  return true;
}