(texi2html.info)Panel formatting function

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6.3.3 Changing the navigation panel formatting
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If you are not satisfied with this scheme, it is possible to control
exactly the formatting of navigation panels by redefining a function
reference. The function controlling the display of navigation panel is
associated with the following function reference:

 -- Function Reference: $navigation_text print_navigation \@buttons
          $vertical
     \@BUTTONS is an array reference which should hold the
     specification of the buttons for that navigation panel. $VERTICAL
     is true if the navigation panel should be vertical.  Returns the
     formatted navigation panel in $NAVIGATION_TEXT.