Changing from folder.gif to folder.jpg.

js/perf/README-jsPerformance.html

@@ -171,7 +171,7 @@ JavaScript.<br>
    locally     as  a  peer   file   to  jsPerformance.pl,     and to a server
    in directory-structure       format.   For example,<br>
   </dl>
-  <dd>      <img src="images/folder.gif" alt="[DIR]" width="14"
+  <dd>      <img src="images/folder.jpg" alt="[DIR]" width="14"
  height="12">
                        Math.PI/&nbsp;&nbsp;&nbsp;---&gt;&nbsp;win2k-1.7ghz-256mb&nbsp;---&gt;&nbsp;results 
                    of test</dd>
@@ -187,7 +187,7 @@ in the "win2k-1.7ghz-256mb" file are the outputs shown:<br>
     <br>
 and create another folder with:<br>
   </dl>
-  <dd><img src="images/folder.gif"
+  <dd><img src="images/folder.jpg"
  alt="[DIR]" width="14" height="12">
                        Math.abs(-180)/&nbsp;&nbsp;&nbsp;&nbsp;---&gt;&nbsp;win2k-1.7ghz-256mb&nbsp;---&gt;results 
                    of test</dd>