diff --git a/doc/elog.gif b/doc/elog.gif
new file mode 100644
index 00000000..b3a497d5
Binary files /dev/null and b/doc/elog.gif differ
diff --git a/doc/elog.jpg b/doc/elog.jpg
deleted file mode 100644
index 34870e1b..00000000
Binary files a/doc/elog.jpg and /dev/null differ
diff --git a/doc/elog_thumb.gif b/doc/elog_thumb.gif
new file mode 100644
index 00000000..de12703e
Binary files /dev/null and b/doc/elog_thumb.gif differ
diff --git a/doc/elog_thumb.jpg b/doc/elog_thumb.jpg
deleted file mode 100755
index b8ae6cf5..00000000
Binary files a/doc/elog_thumb.jpg and /dev/null differ
diff --git a/doc/index.html b/doc/index.html
index 4ed29216..5ed4c22c 100755
--- a/doc/index.html
+++ b/doc/index.html
@@ -77,7 +77,7 @@
                   <table border="0" cellpadding="5">
                      <tr>
                         <td>
-                           <a href="elog.jpg"><img border="0" align="top" src="elog_thumb.jpg" alt="elog.gif"></a>
+                           <a href="elog.gif"><img border="0" align="top" src="elog_thumb.gif" alt="elog.gif"></a>
                         </td>
                         <td valign="top">
                            On the left upper panel is a typical logbook page displayed by Netscape
diff --git a/doc/index_d.html b/doc/index_d.html
index d5e5e918..5ebed5ee 100644
--- a/doc/index_d.html
+++ b/doc/index_d.html
@@ -89,7 +89,7 @@
                   <table border="0" cellpadding="5">
                      <tr>
                         <td>
-                           <a href="elog.jpg"><img border="0" align="top" src="elog_thumb.jpg" alt="elog.gif"></a>
+                           <a href="elog.gif"><img border="0" align="top" src="elog_thumb.gif" alt="elog.gif"></a>
                         </td>
                         <td valign="top">
                            On the left upper panel is a typical logbook page displayed by Netscape