mousemove strange behavior in IE

mousemove strange behavior in IE

Hi,

URL: http://www.ximnet.com.my/jquery/mousemove.htm

I try to do something like Google.com.
When page is loaded, the div will fadein when user move the mouse.

$('#html').mousemove(function() {
               $('#menu').fadeIn(5000);
                return false;
            });


It is working in Firefox,
but in IE, it will fadein even if user do not move the mouse.

Anyone know what is wrong?

Thanks,