[jQuery] can't update div through dialog

[av3nger]

When I try to animate a DIV-element with this code:
$(this).parents(".pane").animate({ backgroundColor: "#fbc7c7" },
"fast")
.animate({ opacity: "hide" }, "slow")

everything works fine. But when I try to do it after I press a button
in a dialog - nothing works! Why?
Here's the code:
$(document).ready(function(){

                $("#dialog").dialog({
                        bgiframe: true,
                        resizable: false,
                        height:140,
                        autoOpen: false,
                        modal: true,
                        overlay: {
                                backgroundColor: '#000',
                                opacity: 0.5
                        },
                        buttons: {
                                'Удалить новость': function() {
                                        $.get(
                                                "news.php",
                                                "act=delete&id="+id
                                        );
                                        $(this).dialog('close');
                                        $(this).parents(".pane").animate({ 
backgroundColor: "#fbc7c7" },
"fast")
                                        .animate({ opacity: "hide" }, "slow")
                                        return false;
                                },
                                'Отмена': function() {
                                        $(this).dialog('close');
                                        return false;
                                }
                        }
                });

        $(".pane .btn-delete").click(function(){
                id = $(this).parents('.pane').find('td:first').attr('id');
                $("#dialog").dialog('open');
                return false;
        });
});