[Moo] 1.11 select class?

[Dailce]

Not sure but I have a bunch of ul lists with class name level2

<ul class="level2">

What's the proper way to select all the ul with this class and change
their heights.
I'm having trouble understanding 1.11 docs.
Using 1.11 because I'm need it for Joomla.

window.addEvent('domready',  function() {
        //select all ul with class
       //foreach element set height????
});

Thanks.