minor changes

nothanks/index.html

@@ -45,10 +45,10 @@
 <ul id='publist'>
 <li><a href='https://hub.xpub.nl/sandbox/~damlanur/makethings.html' target="_blank" class='ext'>Project Website</a></li>
 </ul>
-<img src="img/img1" class='workimg'/>
-<img src="img/img2" class='workimg'/>
-<img src="img/img3" class='workimg'/>
-<img src="img/img4" class='workimg'/>
+<img src="img/img1.png" class='workimg'/>
+<img src="img/img2.png" class='workimg'/>
+<img src="img/img3.png" class='workimg'/>
+<img src="img/img4.png" class='workimg'/>
 </div>
 <div id='publication'>
 <h3 class='gal-title'>Publication</h3>