var result;

function buildInterestList(s,rate){
	var size = s;
        document.write("<select name='interest'>");
        var interest=4.00;
        var r=rate;
        for(var i=0; i<=size; i++){
        	var fmtInterest=interest.toFixed(2);
	        if(interest<r && interest+0.25>=r){
        		document.write('<option value='+fmtInterest+' selected>'+fmtInterest+'</option>');
        		interest+=0.25;
	        } else {
        		document.write('<option value='+fmtInterest+'>'+fmtInterest+'</option>');
                	interest+=0.25;
        	}
	}
	document.write('</select>');
}

function monthlyPayment(form){
	var loan_amount=0;
            loan_amount = form.purchase_price.value - form.down_payment.value;
        var payment = loan_amount * form.interest.value / 100 / 12 / (1 - Math.pow((1 + form.interest.value / 100 / 12), -form.loan_term.value*12));
        result='$'+payment.toFixed(2);
        return result;
}

function toggleLoanCalPopup(price) {
	if(price)
        	$("input:text[name=purchase_price]").val(price);
        if( $("#loanCalculatorPopupContainer").is(":visible") )
        	$("#loanCalculatorPopupContainer").hide();
        else {
        	$("#loanCalculatorPopupContainer").show();
                $("#loanCalculatorPopupContainer").center(true);
        }
}