jquery validation word count integration

How can I integrate word count into bassistance.de validation? For example, i dont want people to enter more than 50 words, and it should show an error to indicate it.

<form action="done.php" method="post" id="mainform"  class="validate">
 <textarea name="message" rows="4" id="message"  class="required" ></textarea>   
 </form>
 

Here is all I have, but i dont know where to go from here

$(document).ready( function() {
 $("form.validate").validate({
     submitHandler: function(form) {
                form.submit();
     }
 })
 

});

any assistance here would be appreciated, i'm not familiar with this plugin at all.

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