function isReady(form) {
  // is address element a real email address?
  if (isEmail(form.subscriber_email) == false) { 
    alert("Please enter your e-mail address.");
    form.subscriber_email.focus();
    return false;
  }
  return true;
}     
function isReady2(form) {
  // is address element a real email address?
  if (isEmail(form.unsubscriber_email) == false) { 
    alert("Please enter your e-mail address to unsubscribe.");
    form.unsubscriber_email.focus();
    return false;
  }
  return true;
}     
     
	// Check for email address: look for [@] and [.] 
function isEmail(elm) {
  if (elm.value.indexOf("@") + "" != "-1" && 
      elm.value.indexOf(".") + "" != "-1" && 
      elm.value != "")  {
  return true;
  } else { 
    return false;
  }
}

function clearField(field) {
		if (field.value == field.defaultValue) {
 		field.value="";
		}
}
	
function checkField(field) {
		if (field.value=="") {
 		field.value = field.defaultValue;
  }
}