// JavaScript Document
<!--
<!-- This script was designed by IT For Charities -->
<!-- IT Information for Charities: www.itforcharities.co.uk -->
<!-- Please e-mail any comments to ivan@itforcharities.co.uk -->

function computeForm(form) {

calcrate = (form.basictax.value / (100 - form.basictax.value))+1;
money= 100 * form.donation.value * calcrate;
money= (Math.round(money))/100;
form.amount.value = money

highrate = 40
claimback = 100* money * ((highrate - form.basictax.value)/100);
claimback= (Math.round(claimback))/100;
form.highrec.value=claimback

}