function CheckForm() {
  var retVal = true;
  if (frmStf.toName.value == "") {
      alert("Please enter your friend's first name");
      frmStf.toName.focus();
      retVal = false;
  } else if (frmStf.toEmail.value == "") {
      alert("Please enter your friend's e-mail address");
      frmStf.toEmail.focus();
      retVal = false;
  } else if (!ValidEmail(frmStf.toEmail.value)) {
      alert("Please enter a valid e-mail address");
      frmStf.toEmail.focus();
      retVal = false;       
  } else if (frmStf.fromName.value == "") {
      alert("Please enter your first name");
      frmStf.fromName.focus();
      retVal = false;
  } else if (frmStf.fromEmail.value == "") {
      alert("Please enter your e-mail address");
      frmStf.fromEmail.focus();
      retVal = false;
  } else if (!ValidEmail(frmStf.fromEmail.value)) {
      alert("Please enter a valid e-mail address");
      frmStf.fromEmail.focus();
      retVal = false;       
  }
  return retVal;
}