// JavaScript Document
/*****************************************/
/** Usable Forms 1.0, May 2003          **/
/** 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 relatedTag = 'TR';

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>');


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

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

while (toBeRemoved.length)
{
var rel = toBeRemoved[0].getAttribute('relation');
if (!document.getElementById(rel))
{
var newMarker = marker.cloneNode(true);
newMarker.id = rel;
toBeRemoved[0].parentNode.replaceChild(newMarker,toBeRemoved[0]);
}
document.getElementById('waitingRoom').appendChild(toBeRemoved.shift());
}
document.onclick = arrangeFormFields;

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

var z = document.getElementsByTagName('select');

// Opera weird with hidden selects in quirks mode: selectedIndex = -1

for (var i=0;i<z.length;i++)
{
if (z[i].options[z[i].selectedIndex].getAttribute('show'))
{
z[i].onchange = arrangeFormFields;
intoMainForm(z[i].options[z[i].selectedIndex].getAttribute('show'))
}
}
}

function arrangeFormFields(e)
{
if (!e) var e = window.event;
var tg = (e.target) ? e.target : e.srcElement;
if (
!(tg.nodeName == 'SELECT' && e.type == 'change')
&&
!(tg.nodeName == 'INPUT' && tg.getAttribute('show'))
   ) return;
var toBeInserted = tg.getAttribute('show');

/* Why no switch statement? Because Netscape 3 gives an error message on encountering it,
and this script must degrade perfectly. */

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

function removeOthers(others,toBeInserted)
{
var toBeRemoved = new Array;
for (var i=0;i<others.length;i++)
{
var show = others[i].getAttribute('show');
if (show != toBeInserted)
toBeRemoved.push(show);
}
while (toBeRemoved.length)
intoWaitingRoom(toBeRemoved.shift());
}

function gatherElements(name)
{
var Elements = new Array;
var x = document.getElementsByTagName(relatedTag);
for (var i=0;i<x.length;i++)
if (x[i].getAttribute('relation') == name)
Elements.push(x[i]);
return Elements;
}

function intoWaitingRoom(name)
{
if (name == 'none') return;
var Elements = gatherElements(name);
if (isInWaitingRoom(Elements[0])) return;
while (Elements.length)
{
if (Elements[0].nestedRels)
for (var i=0;i<Elements[0].nestedRels.length;i++)
intoWaitingRoom(Elements[0].nestedRels[i]);
document.getElementById('waitingRoom').appendChild(Elements.shift())
}

}

function intoMainForm(name)
{
if (name == 'none') return;
var Elements = gatherElements(name);
if (!isInWaitingRoom(Elements[0])) return;
var insertPoint = document.getElementById(name);
while (Elements.length)
insertPoint.parentNode.insertBefore(Elements.shift(),insertPoint)
}

function isInWaitingRoom(obj)
{
while(obj.nodeName != 'BODY')
{
obj=obj.parentNode;
if (obj.id == 'waitingRoom')
return true;
}
return false;
}


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;
}

// 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
}