Problema Copiando Unas Calculadoras

[Ralf13]

El contenido del primer scrpt es este:

function donotinclude() {
document.all.form.taxes.disabled = true;
document.all.form.insurance.disabled= true;
document.all.form.taxes.value = '0.0';
document.all.form.insurance.value = '0.0';
}

function estimate() {
if (document.all.form.tax_chooser.value == '1')
return;
document.all.form.taxes.disabled = true;
document.all.form.insurance.disabled= true;
var taxes = 0.0;
var insurance = 0.0;
taxes = ((document.all.form.homevalue.value.replace(',', '')).valueOf());
insurance = ((document.all.form.homevalue.value.replace(',', '')).valueOf());
if (isNaN(taxes)) {
taxes = 0;
alert('You entered wrong home value');
document.all.form.homevalue.focus();
} else
taxes *= 0.011;
if (isNaN(insurance)) {
insurance = 0;
} else
insurance *= 0.0052;
document.all.form.taxes.value = taxes;
document.all.form.insurance.value = insurance;
}

function enter() {
document.all.form.taxes.disabled = false;
document.all.form.insurance.disabled= false;
document.all.form.taxes.value = '';
document.all.form.insurance.value = '';
document.all.form.taxes.focus();
}

function unlock() {
document.all.form.taxes.disabled = false;
document.all.form.insurance.disabled= false;
}