how to make certain part of the image clickable in html code example

Example: html how to make an image clickable only on certain sections

<!DOCTYPE html>
<html>
   <head>
      <title>HTML area Tag</title>
   </head>

   <body>
      <img src = /images/usemap.gif alt = "usemap" usemap = "#lessons"/>
      <map name = "lessons">
         <area shape = "poly" coords = "74,0,113,29,98,72,52,72,38,27"
            href = "/perl/index.htm" alt = "Perl Tutorial" target = "_blank" />
         <area shape = "rect" coords = "22,83,126,125" alt = "HTML Tutorial"
            href = "/html/index.htm" target = "_blank" />
         <area shape = "circle" coords = "73,168,32" alt = "PHP Tutorial"
            href = "/php/index.htm" target = "_blank" />
      </map>
   </body>
</html>

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Html Example