function y2k(number) { return (number < 1000) ? number + 1900 : number; }

function isDate (day,month,year) {
// checks if date passed is valid
// will accept dates in following format:
// isDate(dd,mm,ccyy), or
// isDate(dd,mm) - which defaults to the current year, or
// isDate(dd) - which defaults to the current month and year.
// Note, if passed the month must be between 1 and 12, and the
// year in ccyy format.

    var today = new Date();
    year = ((!year) ? y2k(today.getYear()):year);
    month = ((!month) ? today.getMonth():month-1);
    if (!day) return false
    var test = new Date(year,month,day);
    if ( (y2k(test.getYear()) == year) && (month == test.getMonth()) && (day == test.getDate()) )
        return true;
    else
        return false
}

function checkDate(dateString)
{
	var dateSplit;

	if (dateString.length == 0)
	{
		return false;
	}
	else
	{
		if (dateString.indexOf("/") > 0)
		{
			dateSplit = dateString.split("/");
		}
		else if (dateString.indexOf("-") > 0)
		{
			dateSplit = dateString.split("-");
		}
		else
		{
			return false;
		}
		
		return isDate(dateSplit[0], dateSplit[1], dateSplit[2]);
	}
	
}