function calculate () {
var price = document.Mortgage.Price.value;
var downpmt = document.Mortgage.DownPmt.value;
var rate = document.Mortgage.AnnIntRate.value;
var years = document.Mortgage.NoYrs.value;
var loanamt = price - downpmt;
var nopmts = years*12;
var morate = rate/1200;
var mopmt = loanamt*(morate/(1-Math.pow((1+morate), -nopmts)));
mopmt *= 100;
mopmt = Math.round(mopmt);
mopmt /= 100;
document.Mortgage.LoanAmt.value = loanamt;
document.Mortgage.NoPmts.value = nopmts;
document.Mortgage.MoPmt.value = mopmt;
}