function check_nl_form() {
  var form_error = false;
  inp_Name = document.getElementById('nl_name');
  inp_Email = document.getElementById('nl_email');
  if ((inp_Name.value.length <= 0) || (inp_Name.value ==
		  inp_Name.defaultValue)) form_error = true;
  if (!validate_nl_email(inp_Email.value)) {
    form_error = true;
  }
    
  if (form_error) {
    alert("Bitte Namen und E-Mail-Adresse eintragen.");
    return(false);
  }
}

function validate_nl_email(email) {
  var strReg = "^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$";
  var regex = new RegExp(strReg);
  return(regex.test(email)); 
}

function clear_nl_field(el) {
if (el.defaultValue==el.value) el.value = ""
}