[jQuery] My slide effect has a brief "flicker" in IE but not FF

[somnamblst]

My hidebar div which does have an image in it has a flicker right at
the completion of any slideUp in IE but not FFF


$(document).ready(function() {
        initSlideboxes();
        function initSlideboxes()
{
$('#slidebar').slideDown("normal");
setTimeout(function()
{
  $('#slidebar').slideUp(3000);

}, 5000);
        $('#slidebar').html($('#hidebar').html());
        $('#slidebartrigger').click(function(){$
('#slidebar').slideToggle(); });
};

});

hidebar div

<div id="hidebar" style="display:none;"><img src="somepic.jpg"
width="910" height="200" alt="" border="0" style="display:block;">

Without display:block I have a 3 pixel difference between IE & FF