[jQuery] problem traversing

[sneaks]

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);
                }
        });