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Not quite sure if I can understand exactly what you are after, but if you look hard enough, there will be something already coded for you to use. Most of the jquery plugins are free, which means you don't have to pull your hair out when yours doesn't work. Don't know how close this is to what you want, but I found it in the first minute of looking. Here's the link!

Though I suppose you may have to understand German to a small extent.