explorer-view-plugin.xml
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When this plugin is installed and active, the standard category listing included as part of the main display 
is replaced by a collapsible menu-based listing, which can be positioned quite freely within the display.

Upload the contents of clientscript (including subdirectories) into your forum/clientscript directory. Then
install the plugin in the usual way via the VB/admincp.

Options are added to the admin settings page to give control over various features:
- active
- placement on page
- whether to display always collapsed; exploded to current category; or fully exploded  

This extra is expensive to use if your LDM library contains a large number (several hundreds) of categories, 
because the entire structure has to be generated/loaded on each page display.