PREREQUISITES: Make sure you check HTML Purifier and make sure that you

have fulfilled all of its requirements before running this.  Specifically,

you'll need the PHP extension ctype (in almost all PHP distributions),

and it's nice to have dom and iconv.

* Place the htmlpurifier folder in your drupal modules directory.

* Download HTML Purifier from http://htmlpurifier.org/ You will need

  4.0.0 or later.

* There are two locations you can install the HTML Purifier library.

  1. Module directory installation. This means installing the library

     folder under the module directory, so that the file

     sites/<site>/modules/htmlpurifier/library/HTMLPurifier.auto.php

     exists.  The easiest way to do this is to extract the entire

     htmlpurifier-x.y.z folder, and then copy the

     htmlpurifier-x.y.z/library folder to your module.  This method is

     convenient and simple, but does not permit HTML Purifier to be shared

     with other modules and can make upgrading the Drupal module a little

     complicated.

  2. The preferred way is making use of the libraries API,

     http://drupal.org/project/libraries. This makes the library

     available to all sites or to a specific site in a multisite

     Drupal setup. You'll need to download the libraries API module

     and enable it before enabling the htmlpurifier module so that in

     the install phase it can find the library.

     Extract the htmlpurifier-x.y.z archive to

     sites/all/libraries/htmlpurifier or to

     sites/<site>/libraries/htmlpurifier for a specific site in a

     multisite Drupal setup.  You can get away with just placing

     the library folder, so that sites/<site>/libraries/htmlpurifier/library

     exists (see below).

     The final setup should be, when making the library and module

     available to all sites:

     sites/all/libraries/htmlpurifier/library

         HTMLPurifier

         HTMLPurifier.autoload.php

         HTMLPurifier.auto.php

         HTMLPurifier.func.php

         HTMLPurifier.includes.php

         HTMLPurifier.kses.php

         HTMLPurifier.path.php

         HTMLPurifier.php

         HTMLPurifier.safe-includes.php

     Now you can safely upgrade your htmlpurifier module without

     having to re-deploy the HTML Purifier library.

* Go to Administer > Modules and enable this module

* You can now create a new text format or add the HTML Purifier to an 

  existing text format. It is recommended that you place HTML Purifier as 

  the last filter in the text format. Reorder the filters if necessary.

WARNING: Due to HTML Purifier's caching mechanism, dynamic filters MUST NOT

be placed before HTML Purifier.