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 var 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 fontSizeSwitcher(f_add)
{
  var f_base = 100;
  var f_value = f_base + parseFloat(f_add);
  
  // set cookie
  createCookie('fontsize',f_add,7);
  
  if (f_value>=f_base&&f_value<=(f_base + 60))
  {
//    document.body.style.fontSize=f_value.toFixed(2)+'%';
    document.getElementById("primary-content").style.fontSize = f_value.toFixed(2)+'%';
  }
}