Gallery image

Hi guys. I wanted to show you a gallery that I am doing. I’m stuck here with some issue. I’ve made the gallery with the buttons but now I wanted to add a previous and next button but I not being able to do. all the rest is working.

the javascript code is this:

$(function () {
var imgContainers = $('div.tabs > div');
$('div.tabs ul.number_nav a').click(function () {
$('div.tabs ul.number_nav a').removeClass('selected');
return false;

the html file is this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="" xml:lang="en" lang="en">


<link href="style.css" rel="stylesheet" type="text/css" />

<script type="text/javascript" src="jquery-1.4.2.js"></script>

<script type="text/javascript" src="code.js"></script>

<div id="gallery"><!--IMG CONTAINER START -->
<div class="tabs">

<div id="image_01">
<div class="image">
<img src="image_one.png" width="795" height="395" />

<div id="image_02" >
<div class="image">
<img src="image_two.png" width="795" height="395" />

<div id="image_03">
<div class="image">
<img src="and_so_on.png" width="795" height="395" />

<ul class="number_nav">
<li><a href="#image_01">01</a></li>
<li><a href="#image_02">02</a></li>
<li><a href="#image_03">03</a></li>

<ul class="prev_next_nav">
<li><a href="#">Previous</a></li> 
/ <li><a href="#">Next</a></li>



can someone help me to make the code to the previous / next buts please? I’m not very good ( nothing at all ) with javascript…

thanks in advance