CSS Sprite in a fluid layout

I have a background image to be used for CSS sprite

Now the issue is I can only use fluid layout (only %, no px) and the % positioning creates an issue wh开发者_StackOverflow社区ile resizing the browser (e.g. some portion of other arrow gets displayed)

How do I fix this ? Can i get an example of how to use % positioning for background ?

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A fluid layout and using fixed positioning are not mutually exclusive.

If you have an element on the page that does not expand, for example a button using a sprite background, then using px for size or position is appropriate (arguably mandatory).