Bulid ExtJS CSS in Company-CI

I need one ExtJS ([login to view URL]) Theme. ExtJS offers a blank theme, with all images. A structural and a design CSS is already included. You can download it here: [login to view URL] (Version 3.3.1) Cause everything is already avaible, you only need to change already existing files. I e.g. work with Firefox and Firebug. You only need to change the images and the CSS. You can see most of the controls here: [login to view URL] For each design you need to change approx 50 images and the CSS. Company-CI Example is append.