function toHundreths(num) {
	return Math.floor(num*100)/100;
}

function calcit() {
	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 = toHundreths(document.temps.LA.value * mi / ( 1 - (1/base)));
	document.temps.MT.value = toHundreths(document.temps.AT.value / 12);
	document.temps.MI.value = toHundreths(document.temps.AI.value / 12);
	var tmpsum = document.temps.LA.value * mi / ( 1 - (1/base)) + document.temps.AT.value / 12 + document.temps.AI.value / 12;
	document.temps.MP.value = toHundreths(tmpsum);
}