$("#age-form").submit(function(){  var day = $("#day").val();  var month = $("#month").val();  var year = $("#year").val();  var age = 18;  var mydate = new Date();  mydate.setFullYear(year, month-1, day);  var currdate = new Date();  currdate.setFullYear(currdate.getFullYear() - age);  if ((currdate - mydate) < 0){    alert("Sorry, only persons over the age of " + age + " may enter this site");    return false;  }  return true;});