Unnamed

<form action="<?= $PHP_SELF ?>" method="POST" onSubmit="return checkForm(this); ">
<input type="radio" name="so_discount" value="SOT">&nbsp;&nbsp;&nbsp;Yes, I am going to pay today and get 10% discount and pay <?= $currency ?><?= number_format($price*0.9, 2) ?> +VAT<br />
<input type="radio" name="so_discount" value="SO5">&nbsp;&nbsp;&nbsp;Yes, I would like to pay within the next 5 business days and get 5% discount and pay <?= $currency ?><?= number_format($price*0.95, 2) ?> +VAT<br />
<input type="radio" name="so_discount" value="" checked>&nbsp;&nbsp;&nbsp;No thank you, I do not want to use this offer<br />
</form>	

if ($_POST["so_discount"] = 'SOT') {
	$stuff .= "Amount=10&";
}
if ($_POST["so_discount"] = 'SO5') {
	$stuff .= "Amount=15&";
}
if ($_POST["so_discount"] = 'SO5') {
	$stuff .= "Amount=" .  (1+VAT) * $Srw['fPrice'] * $fNumberOfDelegates . "&";
}