[jQuery] problem traversing

[jQuery] problem traversing


hi i am attempting to make a small quiz and am having a setback... i
was hoping someone could provide a hint or solution.
heres the html:
    <div id="quiz">
        <ol>
            <li><strong>What is apple in french?</strong>
                <ol>
                    <li><input type="radio" name="q1" /> Pomme de terre</li>
                    <li><input type="radio" name="q1" /> Poire</li>
                    <li><input type="radio" name="q1" /> Appeaux</li>
                    <li class="correct"><input type="radio" name="q1" /> Pomme</li>
                </ol>
                <a href="#" class="quiz-next">Next</a>
            </li>
        </ol>
    </div>
and the jquery:
    $('a.quiz-next').bind('click', function() {
        if ($(this).prev("ol li.correct input[type='radio']").attr('checked')
=='checked') {
            alert(1);
        }
    });