function floor(number)
	{
	  return Math.floor(number*Math.pow(10,2))/Math.pow(10,2);
	}
	
	function dosum()
	{
	  var mi = document.form1.IR.value / 1200;
	  var base = 1;
	  var mbase = 1 + mi;
	  for (i=0; i<document.form1.YR.value * 12; i++)
	  {
	    base = base * mbase
	  }
	  document.form1.PI.value = floor(document.form1.LA.value * mi / ( 1 - (1/base)))
	  document.form1.MT.value = floor(document.form1.AT.value / 12)
	  document.form1.MI.value = floor(document.form1.AI.value / 12)
	  var dasum = document.form1.LA.value * mi / ( 1 - (1/base)) +
		document.form1.AT.value / 12 + 
		document.form1.AI.value / 12;
	  document.form1.MP.value = floor(dasum);
	}