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

function dosum()
{
  var mi = (Math.pow(1+(document.calc.IR.value/100)/2,1/6)-1)
  var base = 1;
  var mbase = 1 + mi;
  for (i=0; i<document.calc.YR.value * 12; i++)
  {
    base = base * mbase
  }
  document.calc.PI.value = floor(document.calc.LA.value * mi / ( 1 - (1/base)))
  document.calc.MT.value = floor(document.calc.AT.value / 12)
  document.calc.MI.value = floor(document.calc.AI.value / 1) + document.calc.HEAT.value/1
  var dasum = document.calc.LA.value * mi / ( 1 - (1/base)) +
	document.calc.AT.value / 12 + 
	document.calc.AI.value / 1+
	document.calc.HEAT.value / 1;
  document.calc.MP.value = floor(dasum);
  document.calc.INRQ.value = floor(document.calc.MP.value / 3*10)
}