diff --git a/index.php b/index.php
index 91c457d..da34851 100644
--- a/index.php
+++ b/index.php
@@ -112,9 +112,9 @@ a:active {
         ?></div>
       </div>
       <div id="content_nav">
-        <img id="backbtn" src="css/grafiken/back.jpg" alt="back" class="back"
+        <img id="backbtn" src="css/grafiken/back.png" alt="back" class="back"
          width="10" height="10" top="0"><img id="fwdbtn"
-         src="css/grafiken/next.jpg" alt="next" class="next" width="10"
+         src="css/grafiken/next.png" alt="next" class="next" width="10"
          height="10" top="0">
       </div>
       <div class="imgdescription" id="imagedescription"><?php