jquery function problem

jquery function problem

I have a problem with jquery. What I would like to make is that tabs will change a class when somebody clicks on a tab. Everything else works ok, excepting this. I spent couple of hours on this and it still doesn't work. It works only when I click on a tab 1st time, but than not anymore.

I tried to include click function inside another function and also many other combinations and still doesn't work. I would be so glad if anybody can tell me where exactly I should include the last click function.
  1. <html>
        <head>
            <title>jQuery: AJAX Tabs</title>    
        <link rel="stylesheet" type="text/css" href="class.css" /> link
            <script type="text/javascript" src="jquery-1.2.3.pack.js"></script>
            <script type="text/javascript">

            
                $(document).ready(function()
                {        
                    $("#tab1").click(function()
                    {
                        $.ajax(
                    {
                    url: "tab1.html",
                    cache: false,
                    success: function(message)
                    {                            
                    $("#tabcontent").remove();
                    $(".container").append(message);                                                
                    }
                    });    
            });
                    
                    $("#tab2").click(function()
                    {
                        $.ajax(
                    {
                    url: "tab2.html",
                    cache: false,
                    success: function(message)
                    {                            
                    $("#tabcontent").remove();
                    $(".container").append(message);
                             
                    }
                    });    
            });
                
          $("#tab1").click(function()
                    {
              $(".navcontainer").empty();
                    $(".navcontainer").append("<ul><li><a id='tab1' class='selected' href='#'>Tab 1</a></li><li><a id='tab2' class='unselected' href='#'>Tab 2</a></li></ul>");             
            });              

          $("#tab2").click(function()
                    {
              $(".navcontainer").empty();
                    $(".navcontainer").append("<ul><li><a id='tab1' class='unselected' href='#'>Tab 1</a></li><li><a id='tab2' class='selected' href='#'>Tab 2</a></li></ul>");             
            });
          });
            </script>
            
        </head>
        <body>
            <a href="http://jetlogs.org/2008/03/17/jquery-ajax-tabs/">&laquo; Code Explanation</a> | <a href="jquery_ajax_tabs.zip">Download Source</a>
            <p>&nbsp;</p>        
            <div class="container">
                <div class="navcontainer">
                    <ul>
                        <li><a id="tab1" href="#">Tab 1</a></li>
                        <li><a id="tab2" href="#">Tab 2</a></li>
                    </ul>
                </div>
                <div id="tabcontent">
                Here is a simple demonstration of how AJAX Tabs work.
                </div>        
            </div>
        </body>
    </html>