function floor(number)
{
  return Math.floor(number*Math.pow(10,2) + 0.5)/Math.pow(10,2);
}

function dosum()
{
  var mi = document.temps.IR.value / 1200;
  var base = 1;
  var mbase = 1 + mi;
  for (i=0; i<document.temps.YR.value * 12; i++)
  {
    base = base * mbase
  }
  document.temps.PI.value = addSeparatorsNF(floor(document.temps.LA.value * mi / ( 1 - (1/base))),'.','.',',');
  document.temps.MT.value = addSeparatorsNF(floor(document.temps.AT.value / 12),'.','.',',');
  document.temps.MI.value = addSeparatorsNF(floor(document.temps.AI.value / 12),'.','.',',');
  var dasum = document.temps.LA.value * mi / ( 1 - (1/base)) +
	document.temps.AT.value / 12 + 
	document.temps.AI.value / 12;
  document.temps.MP.value = addSeparatorsNF(floor(dasum),'.','.',',');
}

function addSeparatorsNF(nStr, inD, outD, sep)
{
	nStr += '';
	var dpos = nStr.indexOf(inD);
	var nStrEnd = '';
	if (dpos != -1) {
		nStrEnd = outD + nStr.substring(dpos + 1, nStr.length);
		nStr = nStr.substring(0, dpos);
	}
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(nStr)) {
		nStr = nStr.replace(rgx, '$1' + sep + '$2');
	}
	return nStr + nStrEnd;
}