var min=12;
var max=50;
function biggerSize() {
   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 = 16;
      }
      if(s!=max) {
         s += 1;
      }
      p[i].style.fontSize = s+"px"
         if(p[i].style.lineHeight) {
         var h = parseInt(p[i].style.lineHeight.replace("px",""));
      } else {
         var h = 23;
      }
      if(h!=max) {
         h += 1;
      }
      p[i].style.lineHeight = s+12+"px"
   }
}
function fontSize() {
   var p = document.getElementsByTagName("p");
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) 
     
      p[i].style.fontSize = 16+"px"
       p[i].style.lineHeight = 23+"px"
   }
}

function smallerSize() {
   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 = 16;
      }
      if(s!=min) {
         s -= 1;
      }
      p[i].style.fontSize = s+"px"

}}