Here’s a snippet of my code: My Firebug development plugin says: $(“.myclass”) is null I have tried various other names, such as: $(‘div.myclass’) and $(‘myclass’), to no avail. How do I get this effect to work on a class? Thanks! Answer $$ in prototype (and mootools) accepts any sort of css selector like $$(‘div#joe’) or $$(‘a[rel=awesome]’) and returns an array.