/*****************************************/

/** 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

}