The CSS sprite generator takes a number of source images and combines them into a single "sprite" image and supplies CSS to map to each image within the sprite. The technique this tool employs is often used to improve the performance of a web site by reducing the number of HTTP requests that the client's browser needs to make.
You can use the online version here:
http://spritegen.website-performance.org/
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These details are provided for information only. No information here is legal advice and should not be used as such.