Jquery Boxy textarea value

I've got a textarea called fou in my Boxy popu开发者_开发百科p. How do I get the value of the text once the user has clicked a Submit button in the popup? I thought $('textarea[id$=fou]').val() wold do the trick but no.

Ideas?

$('#fou').val();

or

$('textarea[id="fou"]').val();