function giftaidcalc(donationfield, fullvaluefield, taxratefield) {
    var donation = $(donationfield).val();
    var taxrate = $(taxratefield).val();
    var calcrate = (taxrate / (100 - taxrate)) + 1;

    var money = 100 * donation * calcrate;
    money = (Math.round(money)) / 100;
    $(fullvaluefield).val(money.toFixed(2));
}
function giftaidreset(fullvaluefield, donatefield) {

    $(fullvaluefield).val("");
    $(donatefield).val("");
}