var defaultFontSize = 75;
var currentFontSize = defaultFontSize;

function changeFontSize(sizeDifference){
	if (sizeDifference == 0) {
		currentFontSize = defaultFontSize;
	} else {
		currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 10);
	}

	if(currentFontSize > 200){
		currentFontSize = 200;
	}else if(currentFontSize < 50){
		currentFontSize = 50;
	}

	document.body.style.fontSize = currentFontSize + '%';
	createCookie('fontSize', currentFontSize +'%', 60);

	return false;
};
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=/";
};