Parallax module for joomla 3.0 and 2.5 it is easy and simple, the module can be used in any place at your joomla template, and it is have options to ad any content you want by the editor in the module.
SOON .. WordPress version
Include text-area to add your content in the module .
upload your image as a background to feel the parallax effect .
Full mobile support
CSS file included ti edit in the style
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Added new option to override the max-width to be full width with any theme. (version 1.3)Source