// JavaScript Document
var min=8;
var max=18;
function increaseElement(elemName) {

 var p = document.getElementsByTagName(elemName);
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s!=max) {
         s += 1;
      }
      p[i].style.fontSize = s+"px"
   }	
	
}

function decreaseElement(elemName) {
   var p = document.getElementsByTagName(elemName);
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s!=min) {
         s -= 1;
      }
      p[i].style.fontSize = s+"px"
   }  
	
}
function increaseFontSize() {
  increaseElement('p');
  increaseElement('a');
  increaseElement('ul');
  increaseElement('h1');
  increaseElement('h2');
  increaseElement('h3');
   increaseElement('b');
    increaseElement('strong');
}
function decreaseFontSize() {
 decreaseElement('p');
  decreaseElement('a');
  decreaseElement('ul');
  decreaseElement('h1');
  decreaseElement('h2');
   decreaseElement('h3');
   decreaseElement('b');
   decreaseElement('strong');
}