var min=8; 
var max=30; 

function increaseFontSize() {
	
var p = document.getElementsByTagName('p');for(i=0;i<p.length;i++) {if(p[i].style.fontSize) {var s = parseInt(p[i].style.fontSize.replace("px",""));
} else {var s = 14;}if(s!=max) {s += 2;}p[i].style.fontSize = s+"px"}

var li = document.getElementsByTagName('li');for(i=0;i<li.length;i++) {if(li[i].style.fontSize) {var s = parseInt(li[i].style.fontSize.replace("px",""));} else {
var s = 16;}if(s!=max) {s += 2;}li[i].style.fontSize = s+"px"}}

function decreaseFontSize() {
	
var p = document.getElementsByTagName('p');for(i=0;i<p.length;i++) {if(p[i].style.fontSize) {var s = parseInt(p[i].style.fontSize.replace("px",""));} else {var s = 14;}if(s!=min) {s -= 2}p[i].style.fontSize = s+"px"} 

var li = document.getElementsByTagName('li');for(i=0;i<li.length;i++) {if(li[i].style.fontSize) {var s = parseInt(li[i].style.fontSize.replace("px",""));} else {
var s = 16;}if(s!=min) {s -= 2;}li[i].style.fontSize = s+"px"} }