Past posts scroller in sidebar

Hi there,

I need to create a news scroller with jQuery and have no idea how to do this.

I have listed all the posts in my sidebar but need two posts to show. I then need an up and a down arrow to scroll through all the posts with only two showing at a time.

Here is the HTML generated:-

<ul class="eventscroller" id="slider">
<li>
<a href="#">
  <h4>Post title</h4>
  <span>Post date</span>
</a>
</li>
</ul>

How can I create the scroller using jquery?

Thank you