If you don't already have Ext 2.0, you will need to download it, and unpack it to a directory within your web project.
Within the \ext\ folder, you will have the following paths:
Take a look at the two folders, and what they contain.
Download and unzip one of the xtheme attachments from my previous post. Each zip has the following basic structure:
The structure of the zip was made to mirror the structure within the resources directory. The css file in the zip needs to go to \ext\resources\css\
and the folder within \images\ needs to move into \ext\resources\images\
You should be able to extract the zip directly to the \ext\resources\ folder.
The official instructions, which I just found, and wish I had before ^^^
1. Download xtheme-silverCherry.zip.
2. Drop the contents of the zip file into your extjs/resources folder
3. In your HTML page, add a link to xtheme-silverCherry.css after ext-all.css:
<link rel="stylesheet" type="text/css" href="resources/css/ext-all.css" />
<link rel="stylesheet" type="text/css" href="resources/css/xtheme-silverCherry.css" />