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

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


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