function resizeText(added) {
  if (document.body.style.fontSize == "") {
    document.body.style.fontSize = "12px";
  }
  document.body.style.fontSize = (12 + parseFloat(added)) + "px";
  
   var x=document.getElementsByTagName("h1");
    for(var i = 0; i < x.length; i++) {
		x[i].style.fontSize = (14 + parseFloat(added)) + "px";
  
	}
	
   var x=document.getElementsByTagName("h2");
    for(var i = 0; i < x.length; i++) {
		x[i].style.fontSize = (14 + parseFloat(added)) + "px";
  
	}
}