function checkForm(form) {
  var error_msg = "";

  if (!form.name.value)
    error_msg += "Please enter your name.<br /><br />";

  if (!form.email.value)
    error_msg += "Please enter your email.";

  if (error_msg != "") {
    msgPopup(error_msg);
    return false;
  } else
    return true;
}