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

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