var a=50;
  function decrease(){a--;document.getElementById('boldstuff').innerHTML= +a;}
  function increase(){a++;document.getElementById('boldstuff').innerHTML= +a;}

if (a < 0)
    a = 0;

if (a > 50)
   a = 50;

var a=50;
  function decrease(){ a = Math.max( a-1,0) ; document.getElementById('boldstuff').innerHTML= a;}
  function increase(){ a = Math.min( a+1,50); document.getElementById('boldstuff').innerHTML= a;}

var a=50;
function decrease(){
   if(a > 0){
      a--;
      document.getElementById('boldstuff').innerHTML= +a;
   }
}
function increase(){
   if(a < 50){
      a++;
      document.getElementById('boldstuff').innerHTML= +a;
   }
}

var a=50;
  function decrease(){if(a>0){a--;document.getElementById('boldstuff').innerHTML= +a;}}
  function increase(){if(a<50){a++;document.getElementById('boldstuff').innerHTML= +a;}}

var a=50;

function decrease(){
  if (a > 0) {
    a--;
    document.getElementById('boldstuff').innerHTML = a;
  }
}

function increase(){
  if (a < 50) {
    a++;
    document.getElementById('boldstuff').innerHTML = a;
  }
}