[jQuery] Form Validation Plugin - animating errorContainer

[jQuery] Form Validation Plugin - animating errorContainer

Hi all
how to animate errorContainer message with Form Validation plugin?
I have this code and I'll want to animate it when occurs an error in my form:
$("#frm").validate({
...
                errorContainer: $("#messageBox"),
...
inside my form:
<div id="messageBox">
<h5 class="msgerr">This form contains errors. Please try again!</h5>
</div>
Thanx.
Marco Antonio