sub by_priority {

  return -1 if $a =~ /^Organization/ ;
  return  1 if $b =~ /^Organization/ ;
  return -1 if $a =~ /^Service/ ;
  return  1 if $b =~ /^Service/ ;
  return -1 if $a =~ /^FAQ/ ;
  return  1 if $b =~ /^FAQ/ ;

  return  0 ;

}

  @htmlfiles = sort by_priority @htmlfiles;