function calculate(resultId){var amount=checkValue(document.loancalc.amount,1);var length=checkValue(document.loancalc.length,1);var rate=checkValue(document.loancalc.rate,1);var deposit=checkValue(document.loancalc.deposit,0);var residual=checkValue(document.loancalc.residual,0);var error=false;if(amount==false||length==false||rate==false){error=true;}
if(error==false){var rateNew=rate/1200;var months=length*12;var topRight=Math.pow((1+rateNew),months);var top=((amount-deposit)*rateNew)*topRight;top=top-(residual*rateNew);var bottom=topRight-1;var total=top/bottom;total=Math.round(total);document.loancalc.final_total.value="$"+total+" /m";}else{document.loancalc.final_total.value="0";}}
function calculate2(resultId){var amount=checkValue(document.loancalc2.amount,1);var length=checkValue(document.loancalc2.length,1);var rate=checkValue(document.loancalc2.rate,1);var deposit=checkValue(document.loancalc2.deposit,0);var residual=checkValue(document.loancalc2.residual,0);var error=false;if(amount==false||length==false||rate==false){error=true;}
if(error==false){var rateNew=rate/1200;var months=length*12;var topRight=Math.pow((1+rateNew),months);var top=((amount-deposit)*rateNew)*topRight;top=top-(residual*rateNew);var bottom=topRight-1;var total=top/bottom;total=Math.round(total);document.loancalc2.final_total.value="$"+total+" /m";}else{document.loancalc2.final_total.value="0";}}
function checkValue(field,zero){amount=field.value;amount=amount.replace("$","");amount=amount.replace(",","");amount=amount.replace(" ","");amount=amount.replace("%","");amount=amount=parseFloat(amount);if(zero==1){if(amount==0||isNaN(amount)){return false;}else{field.value=amount;return amount;}}else{if(amount==0||isNaN(amount)){return 0;}else{field.value=amount;return amount;}}}