function floor(number)
  {
	return Math.floor(number*Math.pow(10,2))/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 = floor(document.temps.LA.value * mi / ( 1 - (1/base)))
	document.temps.MT.value = floor(document.temps.AT.value / 12)
	document.temps.MI.value = 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 = floor(dasum);
  }