Let's say you have 2 themes
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Pink_Theme
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Orange_Theme
Now, in the Pink_Theme folder you have
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Pink_submitBtn.gif
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And, in the Orange_Theme folder:
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Orange_submitBtn.gif
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Orange_submitBtnHover.gif
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Orange_Theme.css
In the Pink_Theme.css you should set the css classes to handle the rollover effect by pointing to the images from the Pink theme folder.
the same for the Orange_Theme.css only that in this stylesheet you'll point to the Orange_SubmitBtn.gif.
Now, if the Pink theme is used, then the Pink images for the rollover are loaded. The same goes for the Orange_Theme.
hope this helps.
Regards.
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