Using the examples from Sohnee and karim79. I tested this and it worked in both FF3.6 and IE6.
<script type="text/javascript">
$(document).ready(function(){
$("#logo").bind("load", function () { $(this).fadeIn('slow'); });
});
</script>
<img src="http://www.gimp.org/tutorials/Lite_Quickies/quintet_hst_big.jpg" id="logo" style="display:none"/>