Tab
Tab size, alignments, colors, font, etc.Tab skins
Skins for tab background, close button, and lock icon are here. You can find many skin images that contributors have uploaded on the server.Of course you can upload and publish your own image files.
Sizing Margins
For skin images that can be grown or shrunk such as tab background, you have to specify Sizing Margins unique to the skin.It consists of 4 values, which indicate pixel size of fixed corner areas in the image file.