I have the following jQuery event that gets fired every time an anchor is clicked. How can I pass a asp.net control (lets say a textbox called "tb_name") as one of the parameters, in addition to the "target" parameter i'm already passing?

<script type="text/javascript">
    $(document).ready(function() {
        $("a").click(function(event) {
            $.ajax({
                type: "POST",
                url: "Default.aspx/Click",
                data: "{target:'" + event.target + "'}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                error: function(xhr, ajaxOptions, thrownError) {
                alert(xhr.responseText);
                    $("#myContent").html(xhr.statusText);

                    //alert(xhr.responseText);
                },
                success: function(msg) {
                    alert(msg.d);
                }
            });
            return false;
        })
    })
</script>