function checkDate(sender, args)
{
    if (sender._selectedDate < new Date()) {
        alert("You cannot select a day earlier than today!");
        sender._selectedDate = new Date();
        // set the date back to the current date
        sender._textbox.set_Value(sender._selectedDate.format(sender._format))
    }
}

function validatepage() {
    var yearlist = document.getElementsByName("year_list");
}