function calcForm(){
var c = document.getElementById('cic').value;
var countAll = 0;
var priceAll = 0;
  for(var i=1; i<=c; i++){

		var a = eval(document.getElementById('ci'+i).value);

		var d = eval(document.getElementById('poi'+i).value);

		document.getElementById('pai'+i).value = a*d;

 		priceAll += eval(document.getElementById('pai'+i).value);
		countAll += eval(document.getElementById('ci'+i).value);
  }
  document.getElementById('cia').value = countAll;
  document.getElementById('pia').value = priceAll;
}

var oldname="";

function showdiv(name) {

  if (oldname == "" ) {
   oldname = name;
  }
  else {
    el=document.getElementById(oldname);
    el.style.display="none";
  }

  el=document.getElementById(name);
  el.style.display="block";

  oldname = name;

}

function hidediv(name) {
  el=document.getElementById(name);
  el.style.display="none";
}