
CSS::Sprite takes a folder of graphics, icons, etc. and combines them into one image (called a "sprite"), saving you space, bandwidth and HTTP requests. It also returns CSS for you to use your new sprite.
Make a folder on your computer. Put all the images you want to include in your sprite in the folder (no repeating backgrounds). The zip the folder (see below). Then drag it onto the upload area, and within a few moments your sprite will be available for download.
If you are on an Apple/Mac you can right click the folder and click compress "yourFolderName"