[jQuery] Problem With update Ajax POST

[jQuery] Problem With update Ajax POST


Hello i'm new with jQuery and i'm trouble with it:
I'm tryin to do an script like a ranking
I have an mysql table to store the votes.
I want to get no refreshs in my page updating the number of votes and
the ranking position.
the script is running here: http://200.198.106.172/beta
Working for three clicks on the arrows in the third i follow the URL.
The problem appears to be reloading the jquery over and over. But i
don't no how to fix it
Here is the entire code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
        <head>
            <title>jquery test</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
    $(function () {
        $('.link1').click( function() {
        $.ajax({
            type: "POST",
            url: this.href,
            success: function(){
                $.ajax({
                    url: "index.php",
                    cache: false,
                    success: function(html){
                        $("#principal").replaceWith(html);
                    }
                });
            }
        });
    return false;
});
});
</script>
</head>
            <body>
<?php
include("db.php");
$query = mysql_query("SELECT * from anuncios ORDER BY contagem DESC");
echo mysql_error();
echo "<div id='principal'>";
while ($anuncio = mysql_fetch_array($query)) {
    echo "<div style='border:1px solid'>\n";
    echo $anuncio['contagem'] . "\n<br />\n";
    echo "<a href=\"processa.php?id={$anuncio[id]}&rank=sobe\" class=
\"link1\"><img src='sobe.gif'></a>\n";
    //echo "<a href='#'> <img src='sobe.gif'> </a>";
    echo "<a href=\"processa.php?id={$anuncio[id]}\" class=
\"link1\">{$anuncio['texto']}</a>\n";
    //echo "<a href=processa.php?id=$anuncio[id] id='link1'>
$anuncio[texto]</a>\n";
    echo "<a href=\"processa.php?id={$anuncio[id]}&rank=desce\" class=
\"link1\"><img src='desce.gif'></a>\n";
    if ($anuncio['contagem'] < 0) {
        echo "<br />editar\n";
    }
    echo "</div>\n";
    echo "<br /><br />";
}
echo "</div>";
?>
</body>
</html>
thanks!