function validateForm(whichform) {
  var submitOk = "true";
  for (var i=0; i<whichform.elements.length; i++) {
    var element = whichform.elements[i];
    if (element.className.indexOf("required") != -1) {
      if (!isFilled(element) || element.value == "this is a required field") {
        element.value = "this is a required field";
        //change className
		//return false;
		submitOk = "false";
      }
    }
    if (element.className.indexOf("email") != -1) {
      if (!isEmail(element) || element.value == "invalid email address") {
        element.value = "invalid email address";
        //return false;
		submitOk = "false";
      }
    }
  }
  if (submitOk == "true") {
	return true;
  }
  return false;
}

function isFilled(field) {
  if (field.value.length < 1 || field.value == field.defaultValue) {
    return false;
  } else {
    return true;
  }
}

function isEmail(field) {
  if (field.value.indexOf("@") == -1 || field.value.indexOf(".") == -1) {
    return false;
  } else {
    return true;
  }
}

function prepareForms() {
  for (var i=0; i<document.forms.length; i++) {
    var thisform = document.forms[i];
    thisform.onsubmit = function() {
      return validateForm(this);
    }
  }
}

addLoadEvent(prepareForms);