var min=8;
var max=18;

function increaseFont(target) {
   var targetEl = document.getElementsByTagName(target);
   for(i=0;i<targetEl.length;i++) {
      if(targetEl[i].style.fontSize) {
         var s = parseInt(targetEl[i].style.fontSize.replace("px",""));
      } else {
         var s = 11;
      }
      if(s!=max) {
         s += 1;
      }
      targetEl[i].style.fontSize = s+"px"
   }
}
function decreaseFont(target) {
   var targetEl = document.getElementsByTagName(target);
   for(i=0;i<targetEl.length;i++) {
      if(targetEl[i].style.fontSize) {
         var s = parseInt(targetEl[i].style.fontSize.replace("px",""));
      } else {
         var s = 11;
      }
      if(s!=min) {
         s -= 1;
      }
      targetEl[i].style.fontSize = s+"px"
   }   
}
function resetFont(target) {
   var targetEl = document.getElementsByTagName(target);
   for(i=0;i<targetEl.length;i++) {
      if(targetEl[i].style.fontSize) {
         var s = parseInt(targetEl[i].style.fontSize.replace("px",""));
      } else {
         var s = 11;
      }
      if(s!=min) {
         s = 11;
      }
      targetEl[i].style.fontSize = s+"px"
   } 
}


function increaseFontSize() {
	increaseFont('p');
	increaseFont('li');
   
}
function decreaseFontSize() {
	decreaseFont('p');
	decreaseFont('li');
    
}
function resetFontSize() {
	resetFont('p');
	resetFont('li');
}