// step = e.g. 100
// value = 0 to count
static S pageNav2(S baseLink, int count, int value, int step, S nVar) {
  new L<S> l;
  baseLink += contains(baseLink, "?") ? "&" : "?"
    + urlencode(nVar) + "=";
  if (value > 0) l.add(ahref(baseLink + max(0, value-step), htmlencode(unicode_leftPointingTriangle())));
  for (int i = 0; i < count; i += step) {
    int n = i/step+1;
    if (pageNav2_showPage(value, i, step))
      if (value == i)
        l.add(b(n));
      else
        l.add(ahref(baseLink + i, n));
  }
  if (value+step < count) l.add(ahref(baseLink + (value+step), htmlencode(unicode_rightPointingTriangle())));
  ret p("Pages: " + lines(l));
}

sbool pageNav2_showPage(int actual, int i, int step) {
  int diff = abs(actual-i)/step;
  ret diff <= 10 || ((i/step) % 10) == 1;
}