var min = 11;
var max = 23;
var limin = 10;
var limax = 23;
var himin = 24;
var himax = 48;
var hiimin = 18;
var hiimax = 30;
var hiiimin = 16;
var hiiimax = 28;
var hvmin = 14;
var hvmax = 26;

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 = 13;
      }
      if(s!=max) {
         s += 1;
      }
      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 = 13;
      }
      if (s != limax) {
         s += 1;
      }
      li[i].style.fontSize = s+"px"
  }
  var hi = document.getElementsByTagName('h1');
  for (i = 0; i < hi.length; i++) {
      if (hi[i].style.fontSize) {
          var s = parseInt(hi[i].style.fontSize.replace("px", ""));
      } else {
          var s = 28;
      }
      if (s != himax) {
          s += 2;
      }
      hi[i].style.fontSize = s + "px"
  }
  var hii = document.getElementsByTagName('h2');
  for (i = 0; i < hii.length; i++) {
      if (hii[i].style.fontSize) {
          var s = parseInt(hii[i].style.fontSize.replace("px", ""));
      } else {
          var s = 20;
      }
      if (s != hiimax) {
          s += 1;
      }
      hii[i].style.fontSize = s + "px"
  }
  var hiii = document.getElementsByTagName('h3');
  for (i = 0; i < hiii.length; i++) {
      if (hiii[i].style.fontSize) {
          var s = parseInt(hiii[i].style.fontSize.replace("px", ""));
      } else {
          var s = 18;
      }
      if (s != hiiimax) {
          s += 1;
      }
      hiii[i].style.fontSize = s + "px"
  }
  var hv = document.getElementsByTagName('h5');
  for (i = 0; i < hv.length; i++) {
      if (hv[i].style.fontSize) {
          var s = parseInt(hv[i].style.fontSize.replace("px", ""));
      } else {
          var s = 16;
      }
      if (s != hvmax) {
          s += 1;
      }
      hv[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 = 13;
      }
      if(s!=min) {
         s -= 1;
      }
      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 = 12;
      }
      if(s != limin) {
         s -= 1;
      }
      li[i].style.fontSize = s+"px"
  }
  var hi = document.getElementsByTagName('h1');
  for (i = 0; i < hi.length; i++) {
      if (hi[i].style.fontSize) {
          var s = parseInt(hi[i].style.fontSize.replace("px", ""));
      } else {
          var s = 28;
      }
      if (s != himin) {
          s -= 2;
      }
      hi[i].style.fontSize = s + "px"
  }
  var hii = document.getElementsByTagName('h2');
  for (i = 0; i < hii.length; i++) {
      if (hii[i].style.fontSize) {
          var s = parseInt(hii[i].style.fontSize.replace("px", ""));
      } else {
          var s = 20;
      }
      if (s != hiimin) {
          s -= 1;
      }
      hii[i].style.fontSize = s + "px"
  }
  var hiii = document.getElementsByTagName('h3');
  for (i = 0; i < hiii.length; i++) {
      if (hiii[i].style.fontSize) {
          var s = parseInt(hiii[i].style.fontSize.replace("px", ""));
      } else {
          var s = 18;
      }
      if (s != hiiimin) {
          s -= 1;
      }
      hiii[i].style.fontSize = s + "px"
  }
  var hv = document.getElementsByTagName('h5');
  for (i = 0; i < hv.length; i++) {
      if (hv[i].style.fontSize) {
          var s = parseInt(hv[i].style.fontSize.replace("px", ""));
      } else {
          var s = 16;
      }
      if (s != hvmin) {
          s -= 1;
      }
      hv[i].style.fontSize = s + "px"
  }
}