var containerTag = 'DIV'; // can be any tag name

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

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

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

function showHideFields(e) {
	var evt = e || window.event;
	var evtTarget = evt.target || evt.srcElement;
	if (evtTarget.nodeName == 'LABEL') {
		var relatedFieldName = evtTarget.getAttribute('for') || evtTarget.getAttribute('htmlFor');
		evtTarget = document.getElementById(relatedFieldName);
	}
		
	if (
		!(evtTarget.nodeName == 'SELECT' && e.type == 'change')
		&&
		!(evtTarget.nodeName == 'INPUT' && evtTarget.getAttribute('rel'))
	   ) return;

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

	if (evtTarget.type == 'checkbox') {
		if (evtTarget.checked)
			intoMainForm(fieldsToBeInserted);
		else
			intoWaitingRoom(fieldsToBeInserted);
	}
	else if (evtTarget.type == 'radio') {
		removeOthers(evtTarget.form[evtTarget.name],fieldsToBeInserted)
		intoMainForm(fieldsToBeInserted);
	}
	else if (evtTarget.type == 'select-one') {
		fieldsToBeInserted = evtTarget.options[evtTarget.selectedIndex].getAttribute('rel');
		removeOthers(evtTarget.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 addEventSimple(obj,evt,fn) {
	if (obj.addEventListener)
		obj.addEventListener(evt,fn,false);
	else if (obj.attachEvent)
		obj.attachEvent('on'+evt,fn);
}

function removeEventSimple(obj,evt,fn) {
	if (obj.removeEventListener)
		obj.removeEventListener(evt,fn,false);
	else if (obj.detachEvent)
		obj.detachEvent('on'+evt,fn);
}

addEventSimple(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
}