eff7a20400f09df9561939b90906e0d7a34216a7
[privoxy.git] / doc / webserver / user-manual / index.html
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
2 "http://www.w3.org/TR/html4/loose.dtd">
3
4 <html>
5 <head>
6   <title>Privoxy 3.0.24 User Manual</title>
7   <meta name="GENERATOR" content=
8   "Modular DocBook HTML Stylesheet Version 1.79">
9   <link rel="NEXT" title="Introduction" href="introduction.html">
10   <link rel="STYLESHEET" type="text/css" href="../p_doc.css">
11   <meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
12   <link rel="STYLESHEET" type="text/css" href="p_doc.css">
13 </head>
14
15 <body class="ARTICLE" bgcolor="#EEEEEE" text="#000000" link="#0000FF" vlink=
16 "#840084" alink="#0000FF">
17   <div class="ARTICLE">
18     <div class="TITLEPAGE">
19       <h1 class="TITLE"><a name="AEN2" id="AEN2">Privoxy 3.0.24 User
20       Manual</a></h1>
21
22       <p class="PUBDATE"><sub><a href="copyright.html">Copyright</a> &copy;
23       2001-2014 by <a href="http://www.privoxy.org/" target="_top">Privoxy
24       Developers</a></sub><br></p>
25
26       <p class="PUBDATE">$Id: user-manual.sgml,v 2.198 2016/01/17 14:32:19
27       fabiankeil Exp $<br></p>
28
29       <div>
30         <div class="ABSTRACT">
31           <a name="AEN9" id="AEN9"></a>
32
33           <p>The <i class="CITETITLE">Privoxy User Manual</i> gives users
34           information on how to install, configure and use <a href=
35           "http://www.privoxy.org/" target="_top">Privoxy</a>.</p>
36
37           <p>Privoxy is a non-caching web proxy with advanced filtering
38           capabilities for enhancing privacy, modifying web page data and
39           HTTP headers, controlling access, and removing ads and other
40           obnoxious Internet junk. Privoxy has a flexible configuration and
41           can be customized to suit individual needs and tastes. It has
42           application for both stand-alone systems and multi-user
43           networks.</p>
44
45           <p>Privoxy is Free Software and licensed under the GNU GPLv2.</p>
46
47           <p>Privoxy is an associated project of Software in the Public
48           Interest (SPI).</p>
49
50           <p>Helping hands and donations are welcome:</p>
51
52           <ul>
53             <li>
54               <p><a href=
55               "http://www.privoxy.org/faq/general.html#PARTICIPATE" target=
56               "_top">http://www.privoxy.org/faq/general.html#PARTICIPATE</a></p>
57             </li>
58
59             <li>
60               <p><a href="http://www.privoxy.org/faq/general.html#DONATE"
61               target=
62               "_top">http://www.privoxy.org/faq/general.html#DONATE</a></p>
63             </li>
64           </ul>
65
66           <p>You can find the latest version of the <i class=
67           "CITETITLE">Privoxy User Manual</i> at <a href=
68           "http://www.privoxy.org/user-manual/" target=
69           "_top">http://www.privoxy.org/user-manual/</a>. Please see the
70           <a href="contact.html">Contact section</a> on how to contact the
71           developers.</p>
72         </div>
73       </div>
74       <hr>
75     </div>
76
77     <div class="TOC">
78       <dl>
79         <dt><b>Table of Contents</b></dt>
80
81         <dt>1. <a href="introduction.html">Introduction</a></dt>
82
83         <dd>
84           <dl>
85             <dt>1.1. <a href="introduction.html#FEATURES">Features</a></dt>
86           </dl>
87         </dd>
88
89         <dt>2. <a href="installation.html">Installation</a></dt>
90
91         <dd>
92           <dl>
93             <dt>2.1. <a href="installation.html#INSTALLATION-PACKAGES">Binary
94             Packages</a></dt>
95
96             <dd>
97               <dl>
98                 <dt>2.1.1. <a href=
99                 "installation.html#INSTALLATION-DEB">Debian and
100                 Ubuntu</a></dt>
101
102                 <dt>2.1.2. <a href=
103                 "installation.html#INSTALLATION-PACK-WIN">Windows</a></dt>
104
105                 <dt>2.1.3. <a href=
106                 "installation.html#INSTALLATION-OS2">OS/2</a></dt>
107
108                 <dt>2.1.4. <a href="installation.html#INSTALLATION-MAC">Mac
109                 OS X</a></dt>
110
111                 <dt>2.1.5. <a href=
112                 "installation.html#OS-X-INSTALL-FROM-PACKAGE">Installation
113                 from ready-built package</a></dt>
114
115                 <dt>2.1.6. <a href=
116                 "installation.html#OS-X-INSTALL-FROM-SOURCE">Installation
117                 from source</a></dt>
118
119                 <dt>2.1.7. <a href=
120                 "installation.html#INSTALLATION-FREEBSD">FreeBSD</a></dt>
121               </dl>
122             </dd>
123
124             <dt>2.2. <a href="installation.html#INSTALLATION-SOURCE">Building
125             from Source</a></dt>
126
127             <dt>2.3. <a href=
128             "installation.html#INSTALLATION-KEEPUPDATED">Keeping your
129             Installation Up-to-Date</a></dt>
130           </dl>
131         </dd>
132
133         <dt>3. <a href="whatsnew.html">What's New in this Release</a></dt>
134
135         <dd>
136           <dl>
137             <dt>3.1. <a href="whatsnew.html#UPGRADERSNOTE">Note to
138             Upgraders</a></dt>
139           </dl>
140         </dd>
141
142         <dt>4. <a href="quickstart.html">Quickstart to Using Privoxy</a></dt>
143
144         <dd>
145           <dl>
146             <dt>4.1. <a href=
147             "quickstart.html#QUICKSTART-AD-BLOCKING">Quickstart to Ad
148             Blocking</a></dt>
149           </dl>
150         </dd>
151
152         <dt>5. <a href="startup.html">Starting Privoxy</a></dt>
153
154         <dd>
155           <dl>
156             <dt>5.1. <a href="startup.html#START-DEBIAN">Debian</a></dt>
157
158             <dt>5.2. <a href="startup.html#START-WINDOWS">Windows</a></dt>
159
160             <dt>5.3. <a href="startup.html#START-UNICES">Solaris, NetBSD,
161             FreeBSD, HP-UX and others</a></dt>
162
163             <dt>5.4. <a href="startup.html#START-OS2">OS/2</a></dt>
164
165             <dt>5.5. <a href="startup.html#START-MACOSX">Mac OS X</a></dt>
166
167             <dt>5.6. <a href="startup.html#CMDOPTIONS">Command Line
168             Options</a></dt>
169           </dl>
170         </dd>
171
172         <dt>6. <a href="configuration.html">Privoxy Configuration</a></dt>
173
174         <dd>
175           <dl>
176             <dt>6.1. <a href="configuration.html#AEN796">Controlling Privoxy
177             with Your Web Browser</a></dt>
178
179             <dt>6.2. <a href="configuration.html#CONFOVERVIEW">Configuration
180             Files Overview</a></dt>
181           </dl>
182         </dd>
183
184         <dt>7. <a href="config.html">The Main Configuration File</a></dt>
185
186         <dd>
187           <dl>
188             <dt>7.1. <a href="config.html#LOCAL-SET-UP">Local Set-up
189             Documentation</a></dt>
190
191             <dd>
192               <dl>
193                 <dt>7.1.1. <a href=
194                 "config.html#USER-MANUAL">user-manual</a></dt>
195
196                 <dt>7.1.2. <a href=
197                 "config.html#TRUST-INFO-URL">trust-info-url</a></dt>
198
199                 <dt>7.1.3. <a href=
200                 "config.html#ADMIN-ADDRESS">admin-address</a></dt>
201
202                 <dt>7.1.4. <a href=
203                 "config.html#PROXY-INFO-URL">proxy-info-url</a></dt>
204               </dl>
205             </dd>
206
207             <dt>7.2. <a href="config.html#CONF-LOG-LOC">Configuration and Log
208             File Locations</a></dt>
209
210             <dd>
211               <dl>
212                 <dt>7.2.1. <a href="config.html#CONFDIR">confdir</a></dt>
213
214                 <dt>7.2.2. <a href="config.html#TEMPLDIR">templdir</a></dt>
215
216                 <dt>7.2.3. <a href=
217                 "config.html#TEMPORARY-DIRECTORY">temporary-directory</a></dt>
218
219                 <dt>7.2.4. <a href="config.html#LOGDIR">logdir</a></dt>
220
221                 <dt>7.2.5. <a href=
222                 "config.html#ACTIONSFILE">actionsfile</a></dt>
223
224                 <dt>7.2.6. <a href=
225                 "config.html#FILTERFILE">filterfile</a></dt>
226
227                 <dt>7.2.7. <a href="config.html#LOGFILE">logfile</a></dt>
228
229                 <dt>7.2.8. <a href="config.html#TRUSTFILE">trustfile</a></dt>
230               </dl>
231             </dd>
232
233             <dt>7.3. <a href="config.html#DEBUGGING">Debugging</a></dt>
234
235             <dd>
236               <dl>
237                 <dt>7.3.1. <a href="config.html#DEBUG">debug</a></dt>
238
239                 <dt>7.3.2. <a href=
240                 "config.html#SINGLE-THREADED">single-threaded</a></dt>
241
242                 <dt>7.3.3. <a href="config.html#HOSTNAME">hostname</a></dt>
243               </dl>
244             </dd>
245
246             <dt>7.4. <a href="config.html#ACCESS-CONTROL">Access Control and
247             Security</a></dt>
248
249             <dd>
250               <dl>
251                 <dt>7.4.1. <a href=
252                 "config.html#LISTEN-ADDRESS">listen-address</a></dt>
253
254                 <dt>7.4.2. <a href="config.html#TOGGLE">toggle</a></dt>
255
256                 <dt>7.4.3. <a href=
257                 "config.html#ENABLE-REMOTE-TOGGLE">enable-remote-toggle</a></dt>
258
259                 <dt>7.4.4. <a href=
260                 "config.html#ENABLE-REMOTE-HTTP-TOGGLE">enable-remote-http-toggle</a></dt>
261
262                 <dt>7.4.5. <a href=
263                 "config.html#ENABLE-EDIT-ACTIONS">enable-edit-actions</a></dt>
264
265                 <dt>7.4.6. <a href=
266                 "config.html#ENFORCE-BLOCKS">enforce-blocks</a></dt>
267
268                 <dt>7.4.7. <a href="config.html#ACLS">ACLs: permit-access and
269                 deny-access</a></dt>
270
271                 <dt>7.4.8. <a href=
272                 "config.html#BUFFER-LIMIT">buffer-limit</a></dt>
273
274                 <dt>7.4.9. <a href=
275                 "config.html#ENABLE-PROXY-AUTHENTICATION-FORWARDING">enable-proxy-authentication-forwarding</a></dt>
276               </dl>
277             </dd>
278
279             <dt>7.5. <a href="config.html#FORWARDING">Forwarding</a></dt>
280
281             <dd>
282               <dl>
283                 <dt>7.5.1. <a href="config.html#FORWARD">forward</a></dt>
284
285                 <dt>7.5.2. <a href="config.html#SOCKS">forward-socks4,
286                 forward-socks4a, forward-socks5 and forward-socks5t</a></dt>
287
288                 <dt>7.5.3. <a href=
289                 "config.html#ADVANCED-FORWARDING-EXAMPLES">Advanced
290                 Forwarding Examples</a></dt>
291
292                 <dt>7.5.4. <a href=
293                 "config.html#FORWARDED-CONNECT-RETRIES">forwarded-connect-retries</a></dt>
294               </dl>
295             </dd>
296
297             <dt>7.6. <a href="config.html#MISC">Miscellaneous</a></dt>
298
299             <dd>
300               <dl>
301                 <dt>7.6.1. <a href=
302                 "config.html#ACCEPT-INTERCEPTED-REQUESTS">accept-intercepted-requests</a></dt>
303
304                 <dt>7.6.2. <a href=
305                 "config.html#ALLOW-CGI-REQUEST-CRUNCHING">allow-cgi-request-crunching</a></dt>
306
307                 <dt>7.6.3. <a href=
308                 "config.html#SPLIT-LARGE-FORMS">split-large-forms</a></dt>
309
310                 <dt>7.6.4. <a href=
311                 "config.html#KEEP-ALIVE-TIMEOUT">keep-alive-timeout</a></dt>
312
313                 <dt>7.6.5. <a href=
314                 "config.html#TOLERATE-PIPELINING">tolerate-pipelining</a></dt>
315
316                 <dt>7.6.6. <a href=
317                 "config.html#DEFAULT-SERVER-TIMEOUT">default-server-timeout</a></dt>
318
319                 <dt>7.6.7. <a href=
320                 "config.html#CONNECTION-SHARING">connection-sharing</a></dt>
321
322                 <dt>7.6.8. <a href=
323                 "config.html#SOCKET-TIMEOUT">socket-timeout</a></dt>
324
325                 <dt>7.6.9. <a href=
326                 "config.html#MAX-CLIENT-CONNECTIONS">max-client-connections</a></dt>
327
328                 <dt>7.6.10. <a href=
329                 "config.html#HANDLE-AS-EMPTY-DOC-RETURNS-OK">handle-as-empty-doc-returns-ok</a></dt>
330
331                 <dt>7.6.11. <a href=
332                 "config.html#ENABLE-COMPRESSION">enable-compression</a></dt>
333
334                 <dt>7.6.12. <a href=
335                 "config.html#COMPRESSION-LEVEL">compression-level</a></dt>
336
337                 <dt>7.6.13. <a href=
338                 "config.html#CLIENT-HEADER-ORDER">client-header-order</a></dt>
339               </dl>
340             </dd>
341
342             <dt>7.7. <a href="config.html#WINDOWS-GUI">Windows GUI
343             Options</a></dt>
344           </dl>
345         </dd>
346
347         <dt>8. <a href="actions-file.html">Actions Files</a></dt>
348
349         <dd>
350           <dl>
351             <dt>8.1. <a href="actions-file.html#AEN2698">Finding the Right
352             Mix</a></dt>
353
354             <dt>8.2. <a href="actions-file.html#AEN2705">How to Edit</a></dt>
355
356             <dt>8.3. <a href="actions-file.html#ACTIONS-APPLY">How Actions
357             are Applied to Requests</a></dt>
358
359             <dt>8.4. <a href=
360             "actions-file.html#AF-PATTERNS">Patterns</a></dt>
361
362             <dd>
363               <dl>
364                 <dt>8.4.1. <a href="actions-file.html#HOST-PATTERN">The Host
365                 Pattern</a></dt>
366
367                 <dt>8.4.2. <a href="actions-file.html#AEN2899">The Path
368                 Pattern</a></dt>
369
370                 <dt>8.4.3. <a href="actions-file.html#TAG-PATTERN">The Tag
371                 Pattern</a></dt>
372
373                 <dt>8.4.4. <a href=
374                 "actions-file.html#NEGATIVE-TAG-PATTERNS">The Negative Tag
375                 Patterns</a></dt>
376               </dl>
377             </dd>
378
379             <dt>8.5. <a href="actions-file.html#ACTIONS">Actions</a></dt>
380
381             <dd>
382               <dl>
383                 <dt>8.5.1. <a href=
384                 "actions-file.html#ADD-HEADER">add-header</a></dt>
385
386                 <dt>8.5.2. <a href="actions-file.html#BLOCK">block</a></dt>
387
388                 <dt>8.5.3. <a href=
389                 "actions-file.html#CHANGE-X-FORWARDED-FOR">change-x-forwarded-for</a></dt>
390
391                 <dt>8.5.4. <a href=
392                 "actions-file.html#CLIENT-HEADER-FILTER">client-header-filter</a></dt>
393
394                 <dt>8.5.5. <a href=
395                 "actions-file.html#CLIENT-HEADER-TAGGER">client-header-tagger</a></dt>
396
397                 <dt>8.5.6. <a href=
398                 "actions-file.html#CONTENT-TYPE-OVERWRITE">content-type-overwrite</a></dt>
399
400                 <dt>8.5.7. <a href=
401                 "actions-file.html#CRUNCH-CLIENT-HEADER">crunch-client-header</a></dt>
402
403                 <dt>8.5.8. <a href=
404                 "actions-file.html#CRUNCH-IF-NONE-MATCH">crunch-if-none-match</a></dt>
405
406                 <dt>8.5.9. <a href=
407                 "actions-file.html#CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</a></dt>
408
409                 <dt>8.5.10. <a href=
410                 "actions-file.html#CRUNCH-SERVER-HEADER">crunch-server-header</a></dt>
411
412                 <dt>8.5.11. <a href=
413                 "actions-file.html#CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</a></dt>
414
415                 <dt>8.5.12. <a href=
416                 "actions-file.html#DEANIMATE-GIFS">deanimate-gifs</a></dt>
417
418                 <dt>8.5.13. <a href=
419                 "actions-file.html#DOWNGRADE-HTTP-VERSION">downgrade-http-version</a></dt>
420
421                 <dt>8.5.14. <a href=
422                 "actions-file.html#EXTERNAL-FILTER">external-filter</a></dt>
423
424                 <dt>8.5.15. <a href=
425                 "actions-file.html#FAST-REDIRECTS">fast-redirects</a></dt>
426
427                 <dt>8.5.16. <a href=
428                 "actions-file.html#FILTER">filter</a></dt>
429
430                 <dt>8.5.17. <a href=
431                 "actions-file.html#FORCE-TEXT-MODE">force-text-mode</a></dt>
432
433                 <dt>8.5.18. <a href=
434                 "actions-file.html#FORWARD-OVERRIDE">forward-override</a></dt>
435
436                 <dt>8.5.19. <a href=
437                 "actions-file.html#HANDLE-AS-EMPTY-DOCUMENT">handle-as-empty-document</a></dt>
438
439                 <dt>8.5.20. <a href=
440                 "actions-file.html#HANDLE-AS-IMAGE">handle-as-image</a></dt>
441
442                 <dt>8.5.21. <a href=
443                 "actions-file.html#HIDE-ACCEPT-LANGUAGE">hide-accept-language</a></dt>
444
445                 <dt>8.5.22. <a href=
446                 "actions-file.html#HIDE-CONTENT-DISPOSITION">hide-content-disposition</a></dt>
447
448                 <dt>8.5.23. <a href=
449                 "actions-file.html#HIDE-IF-MODIFIED-SINCE">hide-if-modified-since</a></dt>
450
451                 <dt>8.5.24. <a href=
452                 "actions-file.html#HIDE-FROM-HEADER">hide-from-header</a></dt>
453
454                 <dt>8.5.25. <a href=
455                 "actions-file.html#HIDE-REFERRER">hide-referrer</a></dt>
456
457                 <dt>8.5.26. <a href=
458                 "actions-file.html#HIDE-USER-AGENT">hide-user-agent</a></dt>
459
460                 <dt>8.5.27. <a href=
461                 "actions-file.html#LIMIT-CONNECT">limit-connect</a></dt>
462
463                 <dt>8.5.28. <a href=
464                 "actions-file.html#LIMIT-COOKIE-LIFETIME">limit-cookie-lifetime</a></dt>
465
466                 <dt>8.5.29. <a href=
467                 "actions-file.html#PREVENT-COMPRESSION">prevent-compression</a></dt>
468
469                 <dt>8.5.30. <a href=
470                 "actions-file.html#OVERWRITE-LAST-MODIFIED">overwrite-last-modified</a></dt>
471
472                 <dt>8.5.31. <a href=
473                 "actions-file.html#REDIRECT">redirect</a></dt>
474
475                 <dt>8.5.32. <a href=
476                 "actions-file.html#SERVER-HEADER-FILTER">server-header-filter</a></dt>
477
478                 <dt>8.5.33. <a href=
479                 "actions-file.html#SERVER-HEADER-TAGGER">server-header-tagger</a></dt>
480
481                 <dt>8.5.34. <a href=
482                 "actions-file.html#SESSION-COOKIES-ONLY">session-cookies-only</a></dt>
483
484                 <dt>8.5.35. <a href=
485                 "actions-file.html#SET-IMAGE-BLOCKER">set-image-blocker</a></dt>
486
487                 <dt>8.5.36. <a href=
488                 "actions-file.html#AEN4638">Summary</a></dt>
489               </dl>
490             </dd>
491
492             <dt>8.6. <a href="actions-file.html#ALIASES">Aliases</a></dt>
493
494             <dt>8.7. <a href="actions-file.html#ACT-EXAMPLES">Actions Files
495             Tutorial</a></dt>
496
497             <dd>
498               <dl>
499                 <dt>8.7.1. <a href=
500                 "actions-file.html#AEN4702">match-all.action</a></dt>
501
502                 <dt>8.7.2. <a href=
503                 "actions-file.html#AEN4724">default.action</a></dt>
504
505                 <dt>8.7.3. <a href=
506                 "actions-file.html#AEN4837">user.action</a></dt>
507               </dl>
508             </dd>
509           </dl>
510         </dd>
511
512         <dt>9. <a href="filter-file.html">Filter Files</a></dt>
513
514         <dd>
515           <dl>
516             <dt>9.1. <a href="filter-file.html#AEN5005">Filter File
517             Tutorial</a></dt>
518
519             <dt>9.2. <a href="filter-file.html#PREDEFINED-FILTERS">The
520             Pre-defined Filters</a></dt>
521
522             <dt>9.3. <a href=
523             "filter-file.html#EXTERNAL-FILTER-SYNTAX">External filter
524             syntax</a></dt>
525           </dl>
526         </dd>
527
528         <dt>10. <a href="templates.html">Privoxy's Template Files</a></dt>
529
530         <dt>11. <a href="contact.html">Contacting the Developers, Bug
531         Reporting and Feature Requests</a></dt>
532
533         <dd>
534           <dl>
535             <dt>11.1. <a href="contact.html#SUFFICIENT-INFORMATION">Please
536             provide sufficient information</a></dt>
537
538             <dt>11.2. <a href="contact.html#CONTACT-SUPPORT">Get
539             Support</a></dt>
540
541             <dt>11.3. <a href="contact.html#REPORTING">Reporting
542             Problems</a></dt>
543
544             <dd>
545               <dl>
546                 <dt>11.3.1. <a href="contact.html#CONTACT-ADS">Reporting Ads
547                 or Other Configuration Problems</a></dt>
548
549                 <dt>11.3.2. <a href="contact.html#CONTACT-BUGS">Reporting
550                 Bugs</a></dt>
551               </dl>
552             </dd>
553
554             <dt>11.4. <a href="contact.html#SECURITY-CONTACT">Reporting
555             security problems</a></dt>
556
557             <dt>11.5. <a href="contact.html#MAILING-LISTS">Mailing
558             Lists</a></dt>
559
560             <dt>11.6. <a href="contact.html#SF-TRACKERS">SourceForge support
561             trackers</a></dt>
562           </dl>
563         </dd>
564
565         <dt>12. <a href="copyright.html">Privoxy Copyright, License and
566         History</a></dt>
567
568         <dd>
569           <dl>
570             <dt>12.1. <a href="copyright.html#LICENSE">License</a></dt>
571
572             <dt>12.2. <a href="copyright.html#HISTORY">History</a></dt>
573
574             <dt>12.3. <a href="copyright.html#AUTHORS">Authors</a></dt>
575           </dl>
576         </dd>
577
578         <dt>13. <a href="seealso.html">See Also</a></dt>
579
580         <dt>14. <a href="appendix.html">Appendix</a></dt>
581
582         <dd>
583           <dl>
584             <dt>14.1. <a href="appendix.html#REGEX">Regular
585             Expressions</a></dt>
586
587             <dt>14.2. <a href="appendix.html#AEN5744">Privoxy's Internal
588             Pages</a></dt>
589
590             <dt>14.3. <a href="appendix.html#CHAIN">Chain of Events</a></dt>
591
592             <dt>14.4. <a href="appendix.html#ACTIONSANAT">Troubleshooting:
593             Anatomy of an Action</a></dt>
594           </dl>
595         </dd>
596       </dl>
597     </div>
598   </div>
599
600   <div class="NAVFOOTER">
601     <hr align="left" width="100%">
602
603     <table summary="Footer navigation table" width="100%" border="0"
604     cellpadding="0" cellspacing="0">
605       <tr>
606         <td width="33%" align="left" valign="top">&nbsp;</td>
607
608         <td width="34%" align="center" valign="top">&nbsp;</td>
609
610         <td width="33%" align="right" valign="top"><a href=
611         "introduction.html" accesskey="N">Next</a></td>
612       </tr>
613
614       <tr>
615         <td width="33%" align="left" valign="top">&nbsp;</td>
616
617         <td width="34%" align="center" valign="top">&nbsp;</td>
618
619         <td width="33%" align="right" valign="top">Introduction</td>
620       </tr>
621     </table>
622   </div>
623 </body>
624 </html>