hello every one just want to know tips for how design maps like in the following web site

http://www.findaproperty.com/

thanks in advance

After taking a quick look at their javascript it looks like they're simply overlaying a transparent image over the base map image when you hover a particular link.

here is the link to the file that seems to be handling the overlay of the images.
http://www.findaproperty.com/fapmaps/js/0/0_1.js

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