PayPal Donation 2

HTML

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_blank">

    <input type="hidden" name="cmd" value="_donations">
    <input type="hidden" name="business" value="[email protected]">

    <label>
        <input type="checkbox" name="amount" class="checkbutton" value="5,00"><span>€05.00</span></label>
    <label>
        <input type="checkbox" name="amount" class="checkbutton" value="10,00"><span>€10.00</span></label>
    <label>
        <input type="checkbox" name="amount" class="checkbutton" value="15,00"><span>€15.00</span></label>
    <label>
        <input type="checkbox" name="amount" class="checkbutton" value="20,00"><span>€20.00</span></label>
    <br>
    <strong>Other Amount</strong>
    <br> €
    <input type="number" class="textBox" name="amount">

    <input type="hidden" name="item_name" value="Donation">
    <input type="hidden" name="item_number" value="Donation">
    <input type="hidden" name="currency_code" value="EUR">
    <input type="hidden" name="lc" value="PT">
    <input type="hidden" name="bn" value="Louzanimales_Donation_WPS_PT">
    <input type="hidden" name="return" value="http://www.louzanimales.py/agradecimentos.htm">

    <br />
    <br />
    <input type="submit" value="Pay with PayPal!">

</form>

CSS

body {
    font-family: sans-serif;
    box-sizing: border-box;
    padding: 50px;
}

label {
    margin: 5px;
    float: left;
    background: #ccc;
}

label:hover {
    background: grey;
    color: #fff;
}

label span {
    text-align: center;
    box-sizing: border-box;
    padding: 10px 15px;
    display: block;
}

label input {
    position: absolute;
    visibility: hidden;
}

input:checked + span {
    background-color: black;
    color: #fff;
}

JavaScript

$('input.checkbutton').on('change', function() {
    $('input.checkbutton').not(this).prop('checked', false);
});

$(".textBox").focus(function() {
    $(".checkbutton").prop("checked", false);
});

$(document).ready(function() {
    $(".checkbutton").change(function() {
        if ($(this).not(":checked")) {
            $('.textBox').val("");
        }
    });
});