function setActiveStyleSheet() {
	if (titleElements[0]==null || titleElements[0]=="" || titleElements[0]=="null" || titleElements[0]=="default"){
		titleElements[0]="small";
	}
	if (titleElements[1]==null || titleElements[1]=="" || titleElements[1]=="null"){
		titleElements[1]="default";
	}

  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") == titleElements[0]+"_"+titleElements[1]) 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;
}

function changeStyle(size, colour){
	if(size!=null && size!='') titleElements[0]=size;
	if(colour!=null && colour!='') titleElements[1]=colour;
	setActiveStyleSheet();
}

var title;
var titleElements;

window.onload = function(e) {
	if(document.getElementById("accessibility")){
		var accessOptions = '<a onclick="changeStyle(\'small\',\'\')" rel="internal" title="small text" accesskey="0" class="small" style="cursor: pointer">a</a> ';
		accessOptions += '<a onclick="changeStyle(\'medium\',\'\')" rel="internal" title="medium text" accesskey="0" class="medium" style="cursor: pointer">a</a> ';
		accessOptions += '<a onclick="changeStyle(\'large\',\'\')" rel="internal" title="large text" accesskey="0" class="large" style="cursor: pointer">a</a>';
		accessOptions += ' | <a href="/accessibility/display" rel="internal" accesskey="0">Display options</a>';
		document.getElementById("accessibility").innerHTML = accessOptions;

	}
	if(document.getElementById("welshaccessibility")){
		var accessOptions = '<a onclick="changeStyle(\'small\',\'\')" rel="internal" title="small text" accesskey="0" class="small" style="cursor: pointer">a</a> ';
		accessOptions += '<a onclick="changeStyle(\'medium\',\'\')" rel="internal" title="medium text" accesskey="0" class="medium" style="cursor: pointer">a</a> ';
		accessOptions += '<a onclick="changeStyle(\'large\',\'\')" rel="internal" title="large text" accesskey="0" class="large" style="cursor: pointer">a</a>';
		accessOptions += ' | <a href="/accessibility/display?lang=cy" rel="internal" accesskey="0">Opsiynau</a>';
		document.getElementById("welshaccessibility").innerHTML = accessOptions;

	}
	var cookie = readCookie("style");
	title = cookie ? cookie : getPreferredStyleSheet();
	titleElements = [title.substring(0,title.indexOf("_")),title.substring(title.indexOf("_")+1,title.length)];
	setActiveStyleSheet();

	if(document.getElementById("emailform")){
		document.getElementById("emailform").onsubmit = function () {
			var validated = validateMe();
			if(!validated){
				return false;
			}
			if(document.getElementById("submit")){
				document.getElementById("submit").disabled=true;
			}
			return true;
		}
	}
}

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