function textFieldFocus(object, defaultValue) {
  if (object.value == defaultValue) {
    object.value = "";
  }
}

function textFieldBlur(object, defaultValue) {
  if (object.value == "") {
    object.value = defaultValue;
  }
}

function passwordFocus(object) {
  if (object.value == "") {
    object.className = "input_text";
  }
}

function passwordBlur(object) {
  if (object.value == "") {
    object.className = "input_text password_focus";
  }
}

function toonDoorstuurBovenaan() {
  document.getElementById("paginadoorsturen").style.top = "200px";
  document.getElementById("paginadoorsturen").style.bottom = "auto";
  document.getElementById("paginadoorsturen").style.display = "block";
}

function toonDoorstuurOnderaan() {
  document.getElementById("paginadoorsturen").style.display = "block";
  document.getElementById("paginadoorsturen").style.top = "auto";
  document.getElementById("paginadoorsturen").style.bottom = "200px";
}

function verbergDoorstuur(id) {
  document.getElementById("paginadoorsturen").style.display = "none";
}