function doit(){
	var rate=0.01*document.getElementById('c1rate').value;
	var balance=document.getElementById('c1balance').value;
	var years=document.getElementById('c1years').value;
	var yearlya=balance*rate/(1-Math.pow(1+rate,-years));
	var yearlyd=balance*rate/(1-Math.pow(1+rate/365,-years*365));
	document.getElementById('c1paymentsa').value=
		isFinite(yearlya)?yearlya.toFixed(2):'----';
	document.getElementById('c1paymentsd').value=
		isFinite(yearlyd)?yearlyd.toFixed(2):'----';
	setTimeout("doit();", 1);
}
doit();