var fieldNames = new Array();
fieldNames["amount"] = "Amount of Loan";
fieldNames["year"] = "Number of Years";
fieldNames["rate"] = "Interest Rate";

function completeForm( form ){
	var pv, fv, np, pmt, ir;
	var error = false;
	
	if( ( pv = getValueFloat( form, "amount" ) ) == null ){
		error = true;
	} else {
		pv *= -1;
	}
	
	if( ( np = getValueFloat( form, "year" ) ) == null ){
		error = true;
	} else {
		np *= 12;
	}
	
	if( ( ir = getValueFloat( form, "rate" ) ) == null ){
		error = true;
	} else {
		ir = ir / 100 / 12;
	}
	
	fv = 0;
	
	pmt = calcPMT( pv, fv, np, ir );
	
	setValueCurrency( form, "payment", pmt );
}