The solution to the “flash of unstyled content” in IE [Look here for a full discussion on what it is], is a simple but effective one. Include the following lines after your closing title and immeditately before any style sheet is called.

<!– to correct the unsightly Flash of Unstyled Content. http://www.bluerobot.com/web/css/fouc.asp –>
<script type=”text/javascript”></script>