How to put part of a map as a link?

I have a scoreboard or an organization chart, In the organization chart, The chart likes a tree.  there is research center, development center, mechanical center, they are rectanglers which I name it as card. I take the whole cart as a map. So when I click research center card in the chart, then research center web page would be displayed. When I click development card in the chart, then development center webpage would be displayed..  
How to implement this?
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CEHJConnect With a Mentor Commented:
JianJunShenAuthor Commented:
Hi, thank you for your quick response. My question is that how do you decide those coordinates?

>>how do you decide those coordinates?

You need to open the image in an editor and find them
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