// JavaScript Document
function showpay() {
	if ((document.calc.loan.value == null || document.calc.loan.value.length == 0) || (document.calc.months.value == null || document.calc.months.value.length == 0) ||	(document.calc.rate.value == null || document.calc.rate.value.length == 0)) { 
		alert("Please enter loan amount.");
	} else {
		var princ = document.calc.loan.value;
		var term  = document.calc.months.value;
		var intr  = document.calc.rate.value / 1200;
		if (document.calc.down) {
			var down  = document.calc.down.value;
		} else {
			var down = 0;
		}		
		var total = (princ - down) * intr / (1 - (Math.pow(1/(1 + intr), term)));
		document.calc.pay.value = Math.round(total) + '.00';
	}
}