通过ajax无法正常向php脚本发送隐藏的输入

i am trying to get my ajax/json script to work, i have looked over stackoverflow, but can't find anything that looks like it would help. Basically all i am trying to do is when a user clicks on a submit button, for a hidden input value to be sent to another php script via ajax, where it will be changed etc... then sent back via ajax and displayed inside a div through a responce, i am not sure what i am doing wrong.

At the moment i am getting nothing, no output or anything.

I will try and be as thorough as possible in the code i give below, thanks for all the help.

AJAX script on main page

<script>
$(document).ready(function () {
  $(".add_detail_land_down").click(function () {
    var hidden_count = $('input[name=addon_detail_hidden_count]').val();
    $.ajax({
      type: "GET",
      url: "ajax_script.php",
      data: {
        hidden_count: hidden_count
      },
      dataType: "json",
      statusCode: {
        success: function (data) {
          $("#total_hidden").html(data.total_hidden);
        }
      }
    });
  })
});
$(".add_detail_land_down").click();
</script>

The form head on main page (thought i might as well add it, just incase)

<form action="" method="post">

The hidden input on main page

<input type="hidden" name="addon_detail_hidden_count" id="addon_detail_hidden_count" class="addon_detail_hidden_count" value="1" />

The submit button for starting the ajax process on main page

<input name="add_detail_land_down" type="submit" class="add_detail_land_down" value="add_detail_down"/>

The code in ajax_script.php

    <?php 

$hidden_count = $_GET["hidden_count"];

$hidden_count = $hidden_count + 1;
include 'connect_to_mysql.php';

echo json_encode(array("total_hidden" => $hidden_count ));

 ?>

Thanks for any and all help