[jQuery] How do I get this to fade in

I'm using the below script to load html into a placeholder, it all
looks groovy but I want it to fade in, where do I add the .fadeIn() to
get this to work?

<script type="text/javascript">
$(document).ready(function(){
        $(".thumbnail li").click(function(){
                $("#large li").html($(this).html());
                return false;
        });

});
</script>