JQuery Mobile çoklu radiobutton post işlemi nasıl yapılır?

<form id="sendanswers" name="sendanswers" method="post"
action="sys/sendanswers.jsp" data-ajax="false">

<div data-role="page" id="soru1">
    <div data-role="header" data-position="fixed">
        <a data-rel="back" data-direction="reverse" data-icon="arrow-l">Back</a>
        <h2>
            Hoş geldiniz
            tayfun</h2>
        <a
            href="#soru2"
            data-icon="arrow-r" data-iconpos="right">Next</a>
    </div>
    <div data-role="content">
        <h5>1+1 = ?</h5>
        <fieldset data-role="controlgroup" data-mini="true">
            <input type="radio" name="answer" id="a" value="1"><label for="a">1</label>
            <input type="radio" name="answer" id="b" value="2"><label for="b">2</label>
            <input type="radio" name="answer" id="c" value="3"><label for="c">3</label>
            <input type="radio" name="answer" id="d" value="4"><label for="d">4</label>
        </fieldset>
    </div>
    <div data-role="footer">
        <h2>Footer</h2>
    </div>
</div>

<div data-role="page" id="soru2">
    <div data-role="header" data-position="fixed">
        <a data-rel="back" data-direction="reverse" data-icon="arrow-l">Back</a>
        <h2>
            Hoş geldiniz
            tayfun</h2>
        <a
            href="#soru3"
            data-icon="arrow-r" data-iconpos="right">Next</a>
    </div>
    <div data-role="content">
        <h5>3 * 4 = ?</h5>
        <fieldset data-role="controlgroup" data-mini="true">
            <input type="radio" name="answer" id="a" value="1"><label for="a">3</label>
            <input type="radio" name="answer" id="b" value="2"><label for="b">4</label>
            <input type="radio" name="answer" id="c" value="3"><label for="c">7</label>
            <input type="radio" name="answer" id="d" value="4"><label for="d">12</label>
        </fieldset>
    </div>
    <div data-role="footer">
        <h2>Footer</h2>
    </div>
</div>

<div data-role="page" id="son">
    <div data-role="header" data-position="fixed">
        <a data-rel="back" data-direction="reverse" data-icon="arrow-l">Back</a>
        <h2>Öğretmen Header</h2>
        <a href="#" data-direction="reverse" data-icon="arrow-r"
            data-iconpos="right">Next</a>
    </div>
    <div data-role="content">
        <h5>
            **<button type="submit" value="Send">Gönder</button>**
        </h5>
    </div>
    <div data-role="footer">
        <h2>Footer</h2>
    </div>
</div>

</form>

bu da sendanswer.jsp dosyam

<% String para = request.getParameter("answer"); out.print(para + " .. x"); String[] values = request.getParameterValues("answer"); for (int i = 0; i < values.length; i++) { out.print(values[i].toString()); } %>

answer değişkeni neden boş geliyor olabilir? amacım soru1'den işaretlenen değeri ve soru2'de işaretlenen değeri alabilmek.. ancak boş geliyor..