//getAmortization(,document.getElementById('term').value,calc.apr.value)
function getPayment(a,n,p) {
	/* Calculates the monthly payment from annual percentage
	   rate, term of loan in months and loan amount. **/

	var i=0;
	var acc=0;
	var base = 1 + p/1200;
	for (i=1;i<=n;i++) 
		{ acc += Math.pow(base,-i); }
	return a/acc;
	}

function calculate() {
		var amount = document.getElementById("amount").value;
		var deposit = document.getElementById("deposit").value;
		amount = amount - deposit
		document.getElementById("Loan Amount").value = amount
		
		var term = document.getElementById("term").value;
		var apr = document.getElementById("apr").value;

		var payment = getPayment(amount, term, apr);
		
		//week
		document.getElementById("week").value = Math.round((payment*12 / 52)*100)/100
		//fortnight
		document.getElementById("fortnight").value = Math.round((payment*12 / 26)*100)/100
		//month
		document.getElementById("month").value = Math.round(payment*100)/100
		}