function y2k(number)    { return (number < 1000) ? number + 1900 : number; }
function padout(number) { return (number < 10) ? '0' + number : number; }

var today = new Date();
var day = today.getDate(), month = today.getMonth(), year = y2k(today.getYear()), whichOne = 0;

function restart() {
    document.form.elements[whichOne].value = '' + padout(month - 0 + 1) + '/'  + padout(day) + '/' + year;
    mywindow.close();
}

function newWindow(number) {
    whichOne = number;
    day = today.getDate(), month = today.getMonth(), year = y2k(today.getYear());
    mywindow=open('/cal.htm','myname','resizable=no,top=100,left=300,width=350,height=270');
    //mywindow.location.href = '/cal.htm';
    if (mywindow.opener == null) mywindow.opener = self;
}

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
}