function calcPay(MORTGAGE, AMORT, INRATE, COMPOUND){
	var compound 	= COMPOUND/12;
	var monTime 	= AMORT * 12;
	var RATE 			= (INRATE*1.0)/100;
	var yrRate 		= RATE/COMPOUND;
	var rdefine 	= Math.pow((1.0 + yrRate),compound)-1.0;
	var PAYMENT 	= (MORTGAGE*rdefine * (Math.pow((1.0 + rdefine),monTime)))/  ((Math.pow((1.0 + rdefine),monTime)) - 1.0);
	PAYMENT = "$" + PAYMENT.toFixed(2);
	return PAYMENT;
}

function calculate(){
	var mort = document.calc_mort.mortamt.value;
	var amor = document.calc_mort.amoratize.value;
	var rate = document.calc_mort.rate.value;
	document.getElementById("total").innerHTML = calcPay(mort,amor,rate,2);
}