How to set/get a portion of images coordinate

i have one image(jpg file) and inside the image has mountain,house ,river
how can i set mountain (X,Y) coordinate? if i click mountain , it will alert "this is a mountain"
or if i mouse hover-over to river, it will alert "this is a river"? how to write a code using Flex api
thank for help

I think you can achieve this by using ImageMap component available in flexlib.
http://flexlib.googlecode.com/svn/trunk/docs/flexlib/controls/ImageMap.html

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