How to pass config to replaceAll();

Hi, i am using the replaceAll function, but i cant figure out how to pass the config settings.

i've found this:

CKEDITOR.replaceAll( 'comment' ,function( textarea, config )
{
//config here
});

I've tried these ways:

config.width : '200px'
config.width = '200px'
this.width = '200px'
this.width : '200px'
textarea.config.width = '200px'
textarea.config.width : '200px'
width : '200px'
width = 200px'

none of them seems to work!

Any ideas?