var form = "";
var submitted = false;
var error = false;
var error_message = "";

function check_input(field_name, field_size, message) {
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var field_value = form.elements[field_name].value;

    if (field_value == '' || field_value.length < field_size) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}

function check_form(form_name) {

  

  error = false;
  form = form_name;
  error_message = "Notwendige Angaben fehlen!\nBitte richtig ausfüllen.\n\n";


  
check_input("domain", 1, "Bitte gebe eine Domain an !");
check_input("email", 2, "Bitte gebe deine gültige E-Mail-Adresse an !");
  
  

  if (error == true) {
    alert(error_message);
    return false;
  } else {
    submitted = true;
    return true;
  }
}