// JavaScript Document

function checkAge() {
	var min_age = 21;
	var year = parseInt(document.forms["age_form"]["year"].value);
	var month = parseInt(document.forms["age_form"]["month"].value) - 1;
	var day = parseInt(document.forms["age_form"]["day"].value);
	var theirDate = new Date((year + min_age), month, day);
	var today = new Date;
	
	if ( (today.getTime() - theirDate.getTime()) < 0) {
		alert("You are too young to enter this contest!");
		return false;
	}

}