function openWindow(dest,aw,ah,target) { 
	if (!aw) aw = 640;
	if (!ah) ah = 510;
	if (!target) target='infowindow'
	Win = window.open(dest,target,'width=' + aw + ',height=' + ah + ',resizable=1,scrollbars=yes,menubar=no,status=no,toolbar=no,location=no,directories=no' );
	Win.focus();
	return void(0);
}

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 = 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);
			}