function font1 () {
for (var i = 0; i < document.getElementsByTagName("p").length; i++) {
 document.getElementsByTagName("p")[i].style.fontSize = "80%";
  }
   for (var m = 0; m < document.getElementsByTagName("li").length; m++) { 
   document.getElementsByTagName("li")[m].style.fontSize = "80%";
 }
}

function font2 () {
for (var i = 0; i < document.getElementsByTagName("p").length; i++) {
 document.getElementsByTagName("p")[i].style.fontSize = "100%";
  }
   for (var m = 0; m < document.getElementsByTagName("li").length; m++) { 
   document.getElementsByTagName("li")[m].style.fontSize = "90%";
 }
}

function font3 () {
for (var i = 0; i < document.getElementsByTagName("p").length; i++) {
  document.getElementsByTagName("li")[i].style.fontSize = "110%";
  document.getElementsByTagName("p")[i].style.fontSize = "130%";

  }
 for (var m = 0; m < document.getElementsByTagName("li").length; m++) { 
   document.getElementsByTagName("li")[m].style.fontSize = "110%";
 }
 
}