stowball/jQuery-rwdImageMaps — pull request #10 by blueyed (2012-11-02 16:25:20+00:00)
Title: If width/height attrib is undefined use the original size

With width:100% (in CSS) for the image used for the map you usually do
not want to set width and height properties of the IMG tag.

In this case rwdImageMaps should use the size of the image itself.