/*****************************************/
/** 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
}