Avail's signature PHP

<?php

/**
 * @author Avail, BlackGuard26
 * @copyright 2012
 */

/**
 * It doesn't work with header("Content-type: image/png");
 * I tried almost all possible image extensions, but this code isn't the right on to show an image
 * I guess, I'll give it another shot later
 */

$map = <<<END
<img src="sig.png" width="790" height="210" alt="Signature" usemap="#sigmap">
<map name="sigmap">
  <area shape="rect" coords="540,5,767,59" alt="Amity Gaming" href="http://amgaming.eu">
  <area shape="rect" coords="529,59,780,109" alt="FourDeltaOne" href="http://fourdeltaone.net">
  <area shape="rect" coords="537,117,780,156" alt="YouTube" href="http://youtube.com/Knife7331">
  <area shape="rect" coords="609,161,780,210" alt="Twitter" href="http://twitter.com/availuuuuuuuu">
</map>
END;

echo($map);
?>