humpdi: DIV positioning

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Hey guys!

For a better understanding of what i want to achieve let me show u a picture:

Those are 4 divs. One (black) is surrounding the other 3. The red one floats on the left, and the green and blue should be floating on the right.

How can i achieve this? Am a pretty CSS noob, so maybe this is a simple question, then pls give it a simple answer ;)

If its not possible to achieve something like this, pls give me a hint to an alternative solution.

Thanks in advance for your kind help! :)

Regards,
humpdi