simple interface

var imageList=(function(){
    var _list=[],_head;

    $('#imageList li').each(function(){
        _list.push($(this));
    });

    _head=_list[0];

    return {
        curr : _head,
        next : function(){
            return this.curr.next().length ? this.curr.next() : _head;
        }
    };
}());