var min=8;
var max=20;
var defaultFontSize = "12px";
var defaultLineHeight = "18px";
var lh = defaultLineHeight;

function increaseFontSize() {
   var p = document.getElementsByTagName('p');
   var li = document.getElementsByTagName('li');
   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;
      }
      lh = s + 10 + "px";
      size = s+"px"
      p[i].style.fontSize = size
   }
   
    
   for(i=0;i<li.length;i++) {
      if(li[i].style.fontSize) {
         var s = parseInt(li[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s!=max) {
         s += 1;
      }
      lh = s + 10 + "px";
      size = s+"px"
      li[i].style.fontSize = size
   }
   

}
function decreaseFontSize() {
   var p = document.getElementsByTagName('p');
   var li = document.getElementsByTagName('li');
   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;
      }
      lh = s + 6 + "px";
      size = s+"px"
      p[i].style.fontSize = size
   }   
    for(i=0;i<li.length;i++) {
      if(li[i].style.fontSize) {
         var s = parseInt(li[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s!=min) {
         s -= 1;
      }
      lh = s + 6 + "px";
      size = s+"px"
      li[i].style.fontSize = size
   }   

}

function setFontSize(size) {
   var p = document.getElementsByTagName('p');
   var li = document.getElementsByTagName('li');
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = size
   }
   for(i=0;i<li.length;i++) {
      li[i].style.fontSize = size
   }

}

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 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;
}

window.onload = function(e) {
  var cookie = readCookie("size");
  var size= cookie ? cookie : defaultFontSize();
  setFontSize(size);
}

window.onunload = function(e) {
  createCookie("size", size, 365);
}