Getting a textbox value and carrying it over to anouther page in javascript

Ok so i use JavaScript to have my output from textbox show in realtime

<script type="text/javascript" >
    $(function () {
        $(".submit,#submit").click(function () {
            var comment = $("#textbox").val();
            var dataString = '&comment=' + comment;
            if (comment == '') {
                alert('Please Give Valid Details');
            }
            else {
                $("#flash").show();
                $("#flash").fadeIn(400).html('<img src="ajax-loader.gif" />Loading Comment...');
                $.ajax({
                    async: false,
                    type: "POST",
                    url: "Default2.aspx",
                    data: dataString,
                    cache: false,
                    success: function (html) {
                        $("div#update").append(html);
                        $("div#update li:last").fadeIn("slow");
                        $("#flash").hide();
                    }
                });
            } return false;
        });
    });

    </script>

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how would i display var comment  and enter it into my db using vb.net?