Image URL:

X,Y:

<area> tag example (http://www.w3schools.com/TAGS/tag_area.asp):

<img src ="planets.gif" width="145" height="126" alt="Planets" usemap ="#planetmap" />

<map name="planetmap">
  <area shape="rect" coords="0,0,82,126" href="sun.htm" alt="Sun" />
  <area shape="circle" coords="90,58,3" href="mercur.htm" alt="Mercury" />
  <area shape="circle" coords="124,58,8" href="venus.htm" alt="Venus" />
</map>