Important notice
In the [YourMagentoDir]/app/design/frontend/default directory should be a folder "SkinName"
How to change the skin around the store
Go to Backend->System->Configuration->Design->Themes Tab and set "Skin (Images / CSS)" fields to SkinName value.
How to change the skin in the same category
Go to Backend->Catalog->Manage Categories->YourCategory->Custom Design Tab and select "Custom Design" field to SkinName value.
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