Find formula structure for a complex function

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I am looking to find the function formula structure of a repeating function like the one in the image linked below....

Something that repeats indefinitely (like a sine wave) on the X-axis. Anybody can help me.

http://i57.tinypic.com/29nbb15.jpg

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Edit: the last answer didn't work for it was symmetrical

$$f(x) = \begin{cases}g(x)^2 & \text{ if } g(x)>0\\ \frac{g(x)^2}{9}& \text{ if } g(x) \leq 0\end{cases}$$ where $g(x) =2( x-[x])-1,5$