var b1 = document.getElementById("n1").offsetHeight;
 var b2 = document.getElementById("n2").offsetHeight;
 var b3 = document.getElementById("n3").offsetHeight;
 var b4 = document.getElementById("n4").offsetHeight;
 
 if (b1<83 && b2<83) {
   document.getElementById("n1").style.height="8em";
   document.getElementById("n2").style.height="8em";
 } else {
  if (b1 > b2) {
 	document.getElementById("n2").style.height=b1+"px";
} else {
   	document.getElementById("n1").style.height=b2+"px";
}
 }
 
 if (b3<83 && b4<83) {
   document.getElementById("n3").style.height="8em";
   document.getElementById("n4").style.height="8em";
 } else {
 if (b3 > b4) {
 	document.getElementById("n4").style.height=b3+"px";
} else {
   	document.getElementById("n3").style.height=b4+"px";
}
 }