diff --git a/doc/adminguide.html b/doc/adminguide.html
index ab12e03e..d7006be4 100755
--- a/doc/adminguide.html
+++ b/doc/adminguide.html
@@ -28,6 +28,7 @@
 <div class=menu>&nbsp;* this section :&nbsp;
 &nbsp;[<a class=nav href="#unix">UNIX</a>]&nbsp;
 &nbsp;[<a class=nav href="#windows">Windows</a>]&nbsp;
+&nbsp;[<a class=nav href="#imagemagick">ImageMagick</a>]&nbsp;
 &nbsp;[<a class=nav href="#config">Configuration</a>]&nbsp;
 &nbsp;[<a class=nav href="config.html">elogd.cfg syntax</a>]&nbsp;
 &nbsp;[<a class=nav href="#secure">Secure Connections</a>]&nbsp;
@@ -223,6 +224,39 @@ into elogd.cfg.<p>
 Note that the variable $remote_host cannot be used inside elogd since the remote host is always
 the proxy host (anybody knows how to fix that???).<p>
 
+<hr><a name="imagemagick"> <div class=section>&nbsp; Installing ImageMagick &nbsp;</div> <p> 
+When images are attached to ELOG entries, thumbnails can be created for quick preview.
+This works also for PDF and PostScript files. ELOG forwards any image operation
+to the ImageMagic and GhostScript packages, which must be installed for this 
+to work. While these packages are installed on most Linux systems, windows users
+have to download and install these pagages manually. ImageMagick can be obtained
+from <a href="http://www.imagemagick.org/">www.imagemagick.org</a> and GhostScript
+can be obtained from <a href="http://pages.cs.wisc.edu/~ghost/">
+http://pages.cs.wisc.edu/~ghost/</a>. After the installation, it has to be
+made sure that both packages are in the path. This can be checked to open
+a command prompt and typing <code><b>identify -version</b></code>. This
+command should return someting like:<p>
+
+<pre>
+C:\>identify -version
+Version: ImageMagick 6.3.8 01/25/08 Q16 http://www.imagemagick.org
+Copyright: Copyright (C) 1999-2008 ImageMagick Studio LLC
+</pre>
+
+When ELOG is started interactively, it checks for the ImageMagick installation
+and shows a note if it is found:<p>
+
+<pre>
+C:\Program Files\ELOG>elogd
+elogd 2.7.2 built Feb 21 2008, 20:00:42 revision 2051
+<b>ImageMagick detected</b>
+Indexing logbooks ... done
+Server listening on port 8080 ...
+</pre>
+
+If ImageMagick is not installed, the thumbnail functions are simply disabled,
+but ELOG can otherwise run normally.<p>
+
 <hr><a name="windows"> <div class=section>&nbsp; Installing and running in Windows &nbsp;</div> <p> <b>
 ELOG</b> is distributed in binary (executable) form for Windows platforms. It will run happily in <I>
 console mode</I> (or "<I>DOS box</I>") under Windows 9x and ME. Under Windows NT and 2000 it is also
diff --git a/doc/config.html b/doc/config.html
index ed145621..e1666807 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -948,18 +948,22 @@ if the file name starts with a <b><code>"/"</code></b> (Unix) or <b><code>
       </li>
       <li>
         <b><code>Thumbnail size = &lt;size&gt;</code></b><br>
-        This option controls the automatic generation of thumbnails for images
-        and PDF/Postscript files. To make this working, one has to install
-        the <a href="http://www.imagemagick.org">ImageMagick</a> package. Make
-        sure that the <b><code>convert -version</code></b> program is in the 
-        path when called from the command line. The thumbnail size 
+        This option determines the default thumbnail size. To make the
+        automatic generation of thumbnails working, the ImageMagick package
+        has to be installed. Refer to the <a href="adminguilde.html#imagemagick">
+        admin guide</a> for installation instructions. The thumbnail size 
         <b><code>size</code></b> gets passed to the <b><code>-thumbnail</code></b>
         option of the conversion. A value of <b><code>300</code></b> converts
         all pictures to thumbnails 300 pixels wide. A value of 
         <b><code>300&gt;</code></b> converts all pictures to thumbnails 300 
         pixels wide if they are larger than 300 pixels initially, and leaves
         them untouched if they are smaller. A value of <b><code>10%</code></b> 
-        converts all pictures to 10% of their original size. 
+        converts all pictures to 10% of their original size. If the 
+        thumbnail size option is missing, the thumbnails will be created
+        with the original image size, and can then be resized and rotated 
+        interactively with the image manipulation buttons:<p>
+        
+        <img src="thumbnail.png"><p> 
       </li>
     </ul><a name="attrib" id="attrib"></a>
     <hr>
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