/*****************************************/
/** Usable Forms 2.0, November 2005     **/
/** Written by ppk, www.quirksmode.org  **/
/** Instructions for use on my site     **/
/**                                     **/
/** You may use or change this script   **/
/** only when this copyright notice     **/
/** is intact.                          **/
/**                                     **/
/** If you extend the script, please    **/
/** add a short description and your    **/
/** name below.                         **/
/*****************************************/

var containerTag = 'DIV';

var compatible = (
  document.getElementById && document.getElementsByTagName && document.createElement
  &&
  !(navigator.userAgent.indexOf('MSIE 5') != -1 && navigator.userAgent.indexOf('Mac') != -1)
  );

if (compatible)
{
  document.write('<style>.accessibility{display: none}</style>');
  var waitingRoom = document.createElement('div');
}

var hiddenFormFieldsPointers = new Object();

function prepareForm()
{
  if (!compatible) return;
  var marker = document.createElement(containerTag);
  marker.style.display = 'none';

  var x = document.getElementsByTagName('select');
  for (var i=0;i<x.length;i++)
    addEvent(x[i],'change',showHideFields)

  var x = document.getElementsByTagName(containerTag);
  var hiddenFields = new Array;
  for (var i=0;i<x.length;i++)
  {
    if (x[i].getAttribute('rel'))
    {
      var y = getAllFormFields(x[i]);
      x[i].nestedRels = new Array();
      for (var j=0;j<y.length;j++)
      {
        var rel = y[j].getAttribute('rel');
        if (!rel || rel == 'none') continue;
        x[i].nestedRels.push(rel);
      }
      if (!x[i].nestedRels.length) x[i].nestedRels = null;
      hiddenFields.push(x[i]);
    }
  }

  while (hiddenFields.length)
  {
    var rel = hiddenFields[0].getAttribute('rel');
    if (!hiddenFormFieldsPointers[rel])
      hiddenFormFieldsPointers[rel] = new Array();
    var relIndex = hiddenFormFieldsPointers[rel].length;
    hiddenFormFieldsPointers[rel][relIndex] = hiddenFields[0];
    var newMarker = marker.cloneNode(true);
    newMarker.id = rel + relIndex;
    hiddenFields[0].parentNode.replaceChild(newMarker,hiddenFields[0]);
    waitingRoom.appendChild(hiddenFields.shift());
  }
  
  setDefaults();
  addEvent(document,'click',showHideFields);
}

function setDefaults()
{
  var y = document.getElementsByTagName('input');
  for (var i=0;i<y.length;i++)
  {
    if (y[i].checked && y[i].getAttribute('rel'))
      intoMainForm(y[i].getAttribute('rel'))
  }

  var z = document.getElementsByTagName('select');
  for (var i=0;i<z.length;i++)
  {
//    if (z[i].options[z[i].selectedIndex].getAttribute('rel'))
//      intoMainForm(z[i].options[z[i].selectedIndex].getAttribute('rel'))
  }

}

function showHideFields(e)
{
  if (!e) var e = window.event;
  var tg = e.target || e.srcElement;

  if (tg.nodeName == 'LABEL')
  {
    var relatedFieldName = tg.getAttribute('for') || tg.getAttribute('htmlFor');
    tg = document.getElementById(relatedFieldName);
  }
    
  if (
    !(tg.nodeName == 'SELECT' && e.type == 'change')
    &&
    !(tg.nodeName == 'INPUT' && tg.getAttribute('rel'))
     ) return;

  var fieldsToBeInserted = tg.getAttribute('rel');

  if (tg.type == 'checkbox')
  {
    if (tg.checked)
      intoMainForm(fieldsToBeInserted);
    else
      intoWaitingRoom(fieldsToBeInserted);
  }
  else if (tg.type == 'radio')
  {
    removeOthers(tg.form[tg.name],fieldsToBeInserted)
    intoMainForm(fieldsToBeInserted);
  }
  else if (tg.type == 'select-one')
  {
    fieldsToBeInserted = tg.options[tg.selectedIndex].getAttribute('rel');
    removeOthers(tg.options,fieldsToBeInserted);
    intoMainForm(fieldsToBeInserted);
  }
}

function removeOthers(others,fieldsToBeInserted)
{
  for (var i=0;i<others.length;i++)
  {
    var show = others[i].getAttribute('rel');
    if (show == fieldsToBeInserted) continue;
    intoWaitingRoom(show);
  }
}

function intoWaitingRoom(relation)
{
  if (relation == 'none') return;
  var Elements = hiddenFormFieldsPointers[relation];
  for (var i=0;i<Elements.length;i++)
  {
    waitingRoom.appendChild(Elements[i]);
    if (Elements[i].nestedRels)
      for (var j=0;j<Elements[i].nestedRels.length;j++)
        intoWaitingRoom(Elements[i].nestedRels[j]);
  }
}

function intoMainForm(relation)
{
  if (relation == 'none') return;
  var Elements = hiddenFormFieldsPointers[relation];
  for (var i=0;i<Elements.length;i++)
  {
    var insertPoint = document.getElementById(relation+i);
    insertPoint.parentNode.insertBefore(Elements[i],insertPoint);
    if (Elements[i].nestedRels)
    {
      var fields = getAllFormFields(Elements[i]);
      for (var j=0;j<fields.length;j++)
      {
        if (!fields[j].getAttribute('rel')) continue;
        if (fields[j].checked || fields[j].selected) 
          intoMainForm(fields[j].getAttribute('rel'));
      }
    }
  }
}

function getAllFormFields(node)
{
  var allFormFields = new Array;
  var x = node.getElementsByTagName('input');
  for (var i=0;i<x.length;i++)
    allFormFields.push(x[i]);
  var y = node.getElementsByTagName('option');
  for (var i=0;i<y.length;i++)
    allFormFields.push(y[i]);
  return allFormFields;
}

/** ULTRA-SIMPLE EVENT ADDING **/

function addEvent(obj,type,fn)
{
  if (obj.addEventListener)
    obj.addEventListener(type,fn,false);
  else if (obj.attachEvent)
    obj.attachEvent("on"+type,fn);
}

addEvent(window,"load",prepareForm);


/** PUSH AND SHIFT FOR IE5 **/

function Array_push() {
  var A_p = 0
  for (A_p = 0; A_p < arguments.length; A_p++) {
    this[this.length] = arguments[A_p]
  }
  return this.length
}

if (typeof Array.prototype.push == "undefined") {
  Array.prototype.push = Array_push
}

function Array_shift() {
  var A_s = 0
  var response = this[0]
  for (A_s = 0; A_s < this.length-1; A_s++) {
    this[A_s] = this[A_s + 1]
  }
  this.length--
  return response
}

if (typeof Array.prototype.shift == "undefined") {
  Array.prototype.shift = Array_shift
}