for(my $i = 0; $i < $#paths; $i++){
$path_prefix .= '../';
}
+ $wiki->{book_plugin_path_prefix} = $path_prefix;
my $head_info = <<"END_OF_HEAD";
<link href="${path_prefix}plugin/book/google-code-prettify/sunburst.css" type="text/css" rel="stylesheet" />