This is what I made to attach descriptions collapsed to labels (added as node description):
<script type="text/javascript">
$(document).ready(function(){
$(".form-item:has(div.description)").children("label").append(function(){
$(this).parent().children('.description').hide();
return '<sup><a href="#" onclick="$(this).parent().parent().parent().find(\'.description\').toggle();" title="'+$(this).parent().children('.description').text()+'"><strong>?</strong></a></sup>';
});
});
</script>
Sandbox here: http://jsfiddle.net/eapo/3ubec/
Any other suggestions?