Navigate through list using arrow keys? (JavaScript/JQ)

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Since you didn’t really explain what you’re having trouble with, I just created a general solution. Hopefully this helps:

var li = $('li');
var liSelected;
$(window).keydown(function(e) {
    if(e.which === 40) {
        if(liSelected) {
            liSelected.removeClass('selected');
            next = liSelected.next();
            if(next.length > 0) {
                liSelected = next.addClass('selected');
            } else {
                liSelected = li.eq(0).addClass('selected');
            }
        } else {
            liSelected = li.eq(0).addClass('selected');
        }
    } else if(e.which === 38) {
        if(liSelected) {
            liSelected.removeClass('selected');
            next = liSelected.prev();
            if(next.length > 0) {
                liSelected = next.addClass('selected');
            } else {
                liSelected = li.last().addClass('selected');
            }
        } else {
            liSelected = li.last().addClass('selected');
        }
    }
});

JSFiddle: http://jsfiddle.net/Vtn5Y/

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