// begin the script to calculate the mortgage var newWindow; function makeNewWindow() { newWindow = window.open("", "", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=auto,resizable=yes,width=375,height=225") } function roundtodinero(n) { dinero = n * 100; dinero = Math.round(dinero); strdinero = "" + dinero; len = strdinero.length; return strdinero.substring(0, len - 2) + "." + strdinero.substring(len - 2, len); } function monthly(principal, years, apr) { rate = apr / 12; payments = years *12; return roundtodinero(principal * rate / (1 - (1 / Math.pow(1 + rate, payments)))); } function monthlyamortization2(principal, years, apr) { var interestpayment; var principalpayment; var i; var payments = years * 12; var monthlyinterest = apr /12; var monthlypayment = monthly(principal, years, apr); var rndprincipal = roundtodinero(principal); var monthpayment = monthly(principal, years, apr); var totinterest = 0; var totpayments= 0; var rndintpayment; var rndprncppayment; var rndprincipal; var dinero1, dinero2, dinero3, strdinero1, strdinero2, strdinero3, len1, len2, len3; makeNewWindow(); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); for(i = 1; i <= payments; i++) { interestpayment = principal * monthlyinterest; dinero1 = interestpayment * 100; dinero1 = Math.round(dinero1); strdinero1 = "" + dinero1; len1 = strdinero1.length; rndintpayment= strdinero1.substring(0, len1 - 2) + "." + strdinero1.substring(len1 - 2, len1); principalpayment = monthlypayment - interestpayment; dinero2 = principalpayment * 100; dinero2 = Math.round(dinero2); strdinero2 = "" + dinero2; len2 = strdinero2.length; rndprncppayment= strdinero2.substring(0, len2 - 2) + "." + strdinero2.substring(len2 - 2, len2); principal -= principalpayment; dinero3 = principal * 100; dinero3 = Math.round(dinero3); strdinero3 = "" + dinero3; len3 = strdinero3.length; rndprincipal= strdinero3.substring(0, len3 - 2) + "." + strdinero3.substring(len3 - 2, len3); totinterest= totinterest + interestpayment; totpayments= totpayments + interestpayment + principalpayment; } dinero3 = totinterest * 100; dinero3 = Math.round(dinero3); strdinero3 = "" + dinero3; len3 = strdinero3.length; totinterest= strdinero3.substring(0, len3 - 2) + "." + strdinero3.substring(len3 - 2, len3); dinero3 = totpayments * 100; dinero3 = Math.round(dinero3); strdinero3 = "" + dinero3; len3 = strdinero3.length; totpayments= strdinero3.substring(0, len3 - 2) + "." + strdinero3.substring(len3 - 2, len3); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write(" "); newWindow.document.write("
Mortgage Payments
Total Loan Amount:$" + (rndprincipal) + "
APR:" + (apr1) + "%
Mortgage Length: " + years + " years
Monthly Payment:$" + (monthpayment) + "
Total Interest Paid:$" + eval(totinterest) + "
Mortgage Total Cost:$" + eval(totpayments) + "
close this window
"); newWindow.document.close(); } function payment(form) { if((form.principal.value.length != 0) && (form.apr.value.length != 0) && (form.years.value.length != 0)) { principal = eval(form.principal.value); apr1= eval(form.apr.value); apr= eval(form.apr.value) / 100.0; years = eval(form.years.value); if (years == 0.0) { alert("You have not specified a year value for the mortgage term, therefore there is no monthly payment value to calculate."); } else { monthlyamortization2(principal, years, apr); } } else { alert("Please fill in all of the areas for an accurate calculation."); } } // -->