function checkFields() {
  missinginfo = "";
  if (document.form.realname.value == "") {
    missinginfo += "\n     -  Your name";
  }
  if ((document.form.email.value == "") || (document.form.email.value.indexOf('@') == -1) || (document.form.email.value.indexOf('.') == -1)) {
    missinginfo += "\n     -  A valid email address";
  }
  if (missinginfo != "") {
    missinginfo ="You failed to correctly fill in:\n" +
    missinginfo + "\n\nPlease re-enter and submit again.";
    alert(missinginfo);
    return false;
  }
  else return true;
}