Googlebot crawler takes since last year js and css as stated by Matt Cutts in this video: http://www.youtube.com/watch?v=B9BWbruCiDc
To answer your question there is a fresh Matt Cutts video here youtube.com/watch?v=EsW8E4dOtR. What he says is that if you use js or css to hide content in a non-spammish way google will not take action against it and will consider your content just like any other content on your site.