【m-single】メールフォームの「入力内容を確認する」がdisabledになってしまう

<input class="btn-orange button form-submit" id="BtnMessageConfirm" type="submit" value="　入力内容を確認する　" disabled="disabled">

<script type="text/javascript">
     $(function(){
          $.get($("#BaseUrl").html() + '/contact/index', function(result){
               $("#MailForm").html(result);
          });
     });
</script>
<div id="BaseUrl" style="display:none"><?php echo $this->base ?></div>
<div id="MailForm"></div>

<script type="text/javascript">
$(document).ready(function(){
$('input[type="submit"]').attr('disabled', 'disabled');
});
$(window).unload(function(){});
$(window).load(function(){
var getTokenUrl = '/basercms/contact2/ajax_get_token';
$.ajaxSetup({cache: false});
$.get(getTokenUrl, function(result) {
$('input[name="data[_Token][key]"]').val(result);
$('input[type="submit"]').removeAttr('disabled');
});
});
</script>