[jQuery] jquery not work when firebug in on

[lanxiazhi]

windows xp
firefox 3.0.6
jquery:1.3.2(latest release)
script:
        $(document).ready(
                function()
                {
                    $("a").click(
                        function(event)
                        {
                            alert("Click");
                        }
                        );
                }
                );
when i turn the firebuf off,it works well.
Please help.
thanks.