var min=10;
var max=16;
function increaseFontSize(){
 var p = document.getElementById('cuerpo');
 var p2 = document.getElementById('intro');
   if(p.style.fontSize){var s = parseInt(p.style.fontSize.replace("px",""));
   }else{var s = 12;}
   if(s!=max){s += 1;}
   p.style.fontSize = s+"px"
   if(p2.style.fontSize){var s2 = parseInt(p2.style.fontSize.replace("px",""));
   }else{var s2 = 12;}
   if(s2!=max){s2 += 1;}
   p2.style.fontSize = s2+"px"
}
function decreaseFontSize(){
 var p = document.getElementById('cuerpo');
 var p2 = document.getElementById('intro');
   if(p.style.fontSize){var s = parseInt(p.style.fontSize.replace("px",""));
   }else{var s = 12;}
   if(s!=min){s -= 1;}
   p.style.fontSize = s+"px"
   if(p2.style.fontSize){var s2=parseInt(p2.style.fontSize.replace("px",""));
   }else{var s2 = 12;}
   if(s2!=min){s2 -= 1;}
   p2.style.fontSize = s2+"px"
}