ajax dialog post

dialog.js

 var commentPolicy = function(username,category){

        var username = username;
        var category = category;
        
        $('.icon-comment').click(function() {
        var id = $(this).attr('name');
        $("#dialog .policy-comment").val('');

        $("#dialog").dialog({
            title: id+" comment",
            buttons: [
                        {
                            text : "Submit",
                            click: function()
                                   {
                                    var comment = $("textarea.span3.policy-comment").val();
                                    
                                    
                                    $.ajax({
                                            context : this,
                                            url : 'include/sql/admin_policy_comment.php',
                                            type: 'POST',
                                            data : {policy_id : id,username : username ,comment:comment,category:category},
                                            success : function (response) {
                                                    $("#dialog .policy-comment").val('');
                                                    $("#dialog").dialog("close");
                                                    $('#dialog').append(response);
                                            }
                                        })
                                   }
                         }
                    ],
             });
        });
    }