Also I found the following link which explains how to use sprite image to show different images. I hope this will give you some insights on using CSS sprites.
We plan to introduce sprite support for the Q2 2010 release, but for the moment using the .rtbImage element is the best solution. You have to set the ImageUrl to point to 1x1 transparent image and use CSS to set its size and background from the sprite.
I hope this helps.
Best wishes,
Tsvetomir Tsonev
the Telerik team
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