function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  
  if (document.getElementById('faqlist'))
	setupfaq();
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

function setupfaq()
{
	if (!document.getElementById || !document.createTextNode)
		return;

	var objTerms = document.getElementsByTagName('dt');
	var objFAQ = document.getElementById('faqlist');
	var objList = document.createElement('ul');
	var objDefinition, objAnchor, objNewterm, objCopy, objItem;

	for (var iCounter=0; iCounter<objTerms.length; iCounter++)
	{
		if (objTerms[iCounter].nextSibling.nodeName == 'DD')
			objDefinition = objTerms[iCounter].nextSibling;
		else
			objDefinition = objTerms[iCounter].nextSibling.nextSibling;

		objAnchor = document.createElement('a');
		objNewterm = document.createElement('dt');
		objCopy = objTerms[iCounter].firstChild;

		objAnchor.setAttribute('href', '#');
		objAnchor.onclick = function(event){return toggleFAQ(this, event);};
		objAnchor.onkeypress = function(event){return toggleFAQ(this, event);};
		objAnchor.appendChild(objCopy);
		objNewterm.appendChild(objAnchor);

		objTerms[iCounter].parentNode.replaceChild(objNewterm, objTerms[iCounter]);
		objDefinition.style.display = 'none';
	}
	
	objList.setAttribute('id',  'faqoptions');
	objItem = document.createElement('li');
	objAnchor = document.createElement('a');
	objAnchor.appendChild(document.createTextNode('Display all answers'));
	objAnchor.setAttribute('href', '#');
	objAnchor.onclick = function(event){return expandAll(this, event);};
	objAnchor.onkeypress = function(event){return expandAll(this, event);};
	objItem.appendChild(objAnchor);
	objList.appendChild(objItem);
	objFAQ.parentNode.insertBefore(objList, objFAQ);
}

function toggleFAQ(objItem, objEvent)
{
	var iKeyCode;

	if (objEvent && objEvent.type == 'keypress')
	{
		if (objEvent.keyCode)
			iKeyCode = objEvent.keyCode;
		else if (objEvent.which)
			iKeyCode = objEvent.which;

		if (iKeyCode != 13 && iKeyCode != 32)
			return true;
	}

	if (objItem.parentNode.nextSibling.nodeName == 'DD')
		var objTarget = objItem.parentNode.nextSibling;
	else
		var objTarget = objItem.parentNode.nextSibling.nextSibling;

	if (objTarget.style.display == 'none')
		objTarget.style.display = 'block';
	else
		objTarget.style.display = 'none';

	return false;
}

function expandAll(objItem, objEvent)
{
	var iKeyCode;

	if (objEvent && objEvent.type == 'keypress')
	{
		if (objEvent.keyCode)
			iKeyCode = objEvent.keyCode;
		else if (objEvent.which)
			iKeyCode = objEvent.which;

		if (iKeyCode != 13 && iKeyCode != 32)
			return true;
	}

	var objDefinitions = document.getElementsByTagName('dd');

	if (objItem.firstChild.data == 'Display all answers')
	{
		objItem.firstChild.data = 'Hide all answers';
		for (var iCounter=0; iCounter<objDefinitions.length; iCounter++)
			objDefinitions[iCounter].style.display = 'block';
	}
	else
	{
		objItem.firstChild.data = 'Display all answers';
		for (var iCounter=0; iCounter<objDefinitions.length; iCounter++)
			objDefinitions[iCounter].style.display = 'none';
	}

	return false;
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);