var prefsLoaded = false;
var currentFontSize = 11;
var maxFontSize = 20;
var minFontSize = 10;
//var baseElement = 'main';
var elements = ['td','a', 'p', 'ol', 'ul', 'li'];
var elementsToResize = ['main', 'footer','main-features'];
function changeFontSize(sizeDifference) {
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference);
	
	if(currentFontSize > maxFontSize) {
		currentFontSize = maxFontSize;
	} else if(currentFontSize < minFontSize) {
		currentFontSize = minFontSize;
	}

	setFontSize(currentFontSize);
}

function changeFontSize(sizeDifference) {
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference);
	if(currentFontSize > maxFontSize) {
		currentFontSize = maxFontSize;
	}else if(currentFontSize < minFontSize) {
		currentFontSize = minFontSize;
	}

	setFontSize(currentFontSize);
};

function setFontSize(fontSize) {
	for(var r = 0; r < elementsToResize.length; r++) {

		if(! document.getElementById(elementsToResize[r]) ) continue;
		var stObj = document.getElementById(elementsToResize[r]);
		stObj.style.fontSize = fontSize + 'px';
		for(var x = 0; x < elements.length; x++) {
			var el = elements[i];
			if( stObj.getElementsByTagName(el) ) {
				var stObjTd = stObj.getElementsByTagName(el);
				for(var i=0; i < stObjTd.length; i++) stObjTd[i].style.fontSize = fontSize + 'px';
			}
		}					   
	}
}

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 = setUserOptions;

function setUserOptions() {
	if(!prefsLoaded) {
		cookie = readCookie("fontSize");
		currentFontSize = cookie ? cookie : currentFontSize;
		setFontSize(currentFontSize);
		prefsLoaded = true;
	}
}

window.onunload = saveSettings;

function saveSettings() {
  createCookie("fontSize", currentFontSize, 365);
}