Its called a image map in HTML.
If you were to look into the forum source code you would fined :
code:
<map name="GFDDMap1"><area href="http://www.msgplus.net" shape="rect" coords="8, 7, 225, 47" title="Go to MsgPlus.net Home Page" /></map>
<img border="0" src="images/topleft.png" width="337" height="59" usemap="#GFDDMap1" /></td>
<td align="right" background="images/mainnavbg.gif">
<map name="GFDDMap0">
<area href="http://www.msgplus.net/news.php" shape="rect" coords="61, 35, 106, 58" title="News" />
<area href="http://www.msgplus.net/features.php" shape="rect" coords="106, 35, 169, 58" title="Features" />
<area href="http://www.msgplus.net/download.php" shape="rect" coords="169, 34, 240, 58" title="Download" />
<area href="http://www.msgplus.net/help.php" shape="rect" coords="239, 34, 277, 58" title="Help" />
<area href="http://www.msgplus.net/community.php" shape="rect" coords="278, 34, 356, 58" title="Community" />
<area href="http://www.msgplus.net/promotion.php" shape="rect" coords="355, 34, 431, 58" title="Promotion" />
</map>
By giving four cordinates to form a rectangle , he is able to link portions of the picture.
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