How to add List items in jQuery?

I have the following code:

if (option.gene开发者_如何学运维ratePagination) {
    elem.append('<ul class=' + option.paginationClass + '></ul>');
    control.children().each(function () {
        $('.' + option.paginationClass, elem).append('<li><a href="#' + number + '">' + (number + 1) + '</a></li>');
        number++;
    });
} else {
    $('.' + option.paginationClass + ' li a', elem).each(function () {
        $(this).attr('href', '#' + number);
        number++;
    });
}
$('.' + option.paginationClass + ' li:eq(' + start + ')', elem).addClass('current');
$('.' + option.paginationClass + ' li a', elem).click(function () {
    if (option.play) {
        pause();
    }

I'd like to add <li class="prev"><a href="">Previous</a></li> as the first list item, and <li class="next"><a href="">Next</a></li> as the last list item.

So:

<ul>
<li class="prev"><a href="">Previous</a></li>
<li><a href="#' + number + '">' + (number + 1) + '</a></li>
<li class="next"><a href="">Next</a></li>
</ul>

How could i do this? Thank you.

---

$('ul').prepend('<li class="prev"><a href="">Previous</a></li>').append('<li class="next"><a href="">Next</a></li>');