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Updated for Drupal 6. Insert Block is no longer a pseudo filter module (using hook_nodeapi). Anyone upgrading will want to ensure they run update.php and enable the Insert Block filter in at least one input format. Additionally, all input formats that use the Insert Block filter will have caching disabled. To prevent performance issues, it is recommended to _not_ apply the Insert Block filter to a site's default input format, and to instead create a special input format for Insert Block.
In hook_nodeapi(), changed $op = "view" to $op = "alter" for Drupal 5 compatibility. (#131006 Thanks jardeeq!)
Filter tips are now handled by hook_filter_tips(). Use of hook_help() for filter tips is not supported in Drupal 5.
Used hook_help() to add page to help system, since users may not see filter tips because they'd have to assign the "filter" to an input format - which actually isn't necessary to make the module work since it uses hook_nodeapi() to get the job done. So, having a help page for the module ensures the tip is available somewhere.