function is_numeric_lr(form) {
	var msg = "";
	
	if (form.loan_amt.value == "") {
		msg += "Please enter a loan amount.\n";
	}
	
	if (form.interest.value == "") {
		msg += "Please enter an interest rate in percentage.\n";
	}
	
	if (form.loan_term.value == "") {
		msg += "Please enter a loan term in years.\n";
	}

	var num = /(^\d+$)|(^\d+\.\d+$)/;
	if (! (num.test(form.loan_amt.value) && num.test(form.interest.value) && num.test(form.loan_term.value))) {
		msg += "Please only enter numbers, no characters such as dollar sign, commas, etc.\n";
	}
	
	if (form.loan_term.value > 40) {
		msg += "Loan term cannot be more than 40 years.\n";	
	}	

	if (msg == "") {
		return true;
	}
	else {
		alert(msg);
		return false;
	}
}