To specify where in an HTML output file to invoke one or more browse macros, in the [Inserts] section assign the macro(s) to one or both of the following keywords:
[Inserts] Top = <$_prev><br /><br /><$_next><br /><br /> Bottom = <$_top>
See §27.6 Inserting HTML code in split and extract files for additional [Inserts] keywords you can use to specify other file locations, and for keyword prefixes you can use to restrict macro assignment by output file type.