<!--function compute_down(which){    var mortgage = document.MortgageForm;    var percentvalue, down, loan;    /* preprocess loanamount */    loan = mortgage.loanamount.value;    while ((pos=loan.indexOf(",")) >= 0)    {    temp1 = loan.substring(0, pos);    temp2 = loan.substring(pos+1, loan.length);    loan = temp1 + temp2;    }    /* preprocess downamount */    down = mortgage.downamount.value;    while ((pos=down.indexOf(",")) >= 0)    {    temp1 = down.substring(0, pos);    temp2 = down.substring(pos+1, down.length);    down = temp1 + temp2;    }    if (which == "downamount")    {    percentvalue = Math.floor((parseFloat(down)/parseFloat(loan)*100.0)*100) / 100;    mortgage.percent.value = percentvalue;    }    if (which == "percent")    {    down = parseInt(parseFloat(loan) * parseFloat(mortgage.percent.value) / 100.0);    mortgage.downamount.value = down;    }    /* put comma in dollar values */    mortgage.loanamount.value = comma_it(mortgage.loanamount.value);    mortgage.downamount.value = comma_it(mortgage.downamount.value);}function compute(){    var mortgage = document.MortgageForm;    var annualRate, monthRate, months, principle, payment;    var loan, down, pos, temp1, temp2;            /* validate certain values */    if (parseInt(mortgage.loanamount.value) <= 0)    {    if (parseInt(mortgage.loanamount.defaultValue) > 0)    {        mortgage.loanamount.value = mortgage.loanamount.defaultValue;    }    else    {        mortgage.loanamount.value = "250000";    }    }    if (parseInt(mortgage.downamount.value) < 0)    {    if (parseInt(mortgage.downamount.defaultValue) >= 0)    {        mortgage.downamount.value = mortgage.downamount.defaultValue;        mortgage.percent.value = mortgage.percent.defaultValue;    }    else    {        mortgage.downamount.value = parseInt(parseFloat(mortgage.loanamount.value) * 20.0 / 100.0);        mortgage.percent.value = "20.0";    }    }    if (parseInt(mortgage.percent.value) < 0)    {    if (parseInt(mortgage.percent.defaultValue) >= 0)    {        mortgage.downamount.value = mortgage.downamount.defaultValue;        mortgage.percent.value = mortgage.percent.defaultValue;    }    else    {        mortgage.downamount.value = parseInt(parseFloat(mortgage.loanamount.value) * 20.0 / 100.0);        mortgage.percent.value = "20.0";    }    }    if (parseFloat(mortgage.rate.value) < 0.0)    {    if (parseFloat(mortgage.rate.defaultValue) > 0.0)    {        mortgage.rate.value = mortgage.rate.defaultValue;    }    else    {        mortgage.rate.value = "8.5";    }    }    if (parseInt(mortgage.year.value) <= 0)    {    if (parseInt(mortgage.year.defaultValue) > 0)    {        mortgage.year.value = mortgage.year.defaultValue;    }    else    {        mortgage.year.value = "30";    }    }    /* preprocess loanamount */    loan = mortgage.loanamount.value;    while ((pos=loan.indexOf(",")) >= 0)    {    temp1 = loan.substring(0, pos);    temp2 = loan.substring(pos+1, loan.length);    loan = temp1 + temp2;    }    /* preprocess downamount */    down = mortgage.downamount.value;    while ((pos=down.indexOf(",")) >= 0)    {    temp1 = down.substring(0, pos);    temp2 = down.substring(pos+1, down.length);    down = temp1 + temp2;    }    /* the real computation */    annualRate = parseFloat(mortgage.rate.value) / 100;    monthRate = annualRate / 12.0;    months = parseInt(mortgage.year.value) * 12;    principle = parseInt(loan) - parseInt(down);    payment = Math.floor((principle*monthRate)/(1-Math.pow((1+monthRate),(-1*months)))*100)/100;    /* put value up */    mortgage.loan.value = principle;    mortgage.numberof.value = months;    mortgage.monthly.value = payment;    /* put comma in dollar values */    mortgage.loanamount.value = comma_it(mortgage.loanamount.value);    mortgage.downamount.value = comma_it(mortgage.downamount.value);    mortgage.loan.value = comma_it(mortgage.loan.value);    mortgage.monthly.value = comma_it(mortgage.monthly.value);}function comma_it(target){    var newtarget, decimal, pos, temp1, temp2, i;    newtarget = "";    /* get rid of existing commas */    while ((pos=target.indexOf(",")) >= 0)    {    temp1 = target.substring(0, pos);    temp2 = target.substring(pos+1, target.length);    target = temp1 + temp2;    }    /* extract decimals for safe keeping */    decimal = "";    if ((pos=target.indexOf(".")) >= 0)    {    decimal = target.substring(pos, target.length);    target = target.substring(0, pos);    }    /* here comes the real work */    for (i = target.length-1; i >= 0; i--)    {    if (((target.length-i-1) % 3) == 0)    {        if ((target.length-i-1) > 0)        {        newtarget = "," + newtarget;        }    }    newtarget = target.substring(i,i+1) + newtarget;    }    /* add on any decimals */    newtarget = newtarget + decimal;    return newtarget;}// -->