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--- a/presentations/ipaw-2012/prov-dm/overview/index.html	Mon Jun 11 13:52:47 2012 +0100
+++ b/presentations/ipaw-2012/prov-dm/overview/index.html	Mon Jun 11 14:13:32 2012 +0100
@@ -268,7 +268,7 @@
 	<h2>Layered Model</h2>
 
 
-  <img src="images/prov-family1.jpg" alt="layered model" style="max-width: 100%; "  />
+  <img src="images/prov-family1.png" alt="layered model" style="max-width: 100%; "  />
 
 </div>
 
@@ -278,7 +278,7 @@
 	<h2>Layered Model</h2>
 
 
-  <img src="images/prov-family2.jpg" alt="layered model" style="max-width: 100%; "  />
+  <img src="images/prov-family2.png" alt="layered model" style="max-width: 100%; "  />
 
 </div>