+ 'fromName' => name of the sender
+ 'fromEmail' => email fo the sender
+ 'replyTo' => replyTo address to direct responses
+ 'toEmail' => destination email address
+ 'messageSubject' => subject of the message
+ 'htmlVersion' => html version of the message
+ 'textVersion' => text only version of the message
+ 'additionalMailHeader' => additions to the smtp mail header
+
+### 'emailer_send'
+is called before calling PHP's mail().
+$b is an array, params to mail()
+
+ 'to'
+ 'subject'
+ 'body'
+ 'headers'
+
+### 'nav_info'
+is called after the navigational menu is build in include/nav.php.
+$b is an array containing $nav from nav.php.
+
+### 'template_vars'
+is called before vars are passed to the template engine to render the page.
+The registered function can add,change or remove variables passed to template.
+$b is an array with:
+
+ 'template' => filename of template
+ 'vars' => array of vars passed to template
+
+### ''acl_lookup_end'
+is called after the other queries have passed.
+The registered function can add, change or remove the acl_lookup() variables.
+
+ 'results' => array of the acl_lookup() vars
+
+
+Complete list of hook callbacks
+---
+
+Here is a complete list of all hook callbacks with file locations (as of 14-Feb-2012). Please see the source for details of any hooks not documented above.