function CalculaPagina(form_f, max)
{
  if (form_f.inicial.value <= 0)
  {
   form_f.inicial.value = 1;
  }

  j = (form_f.inicial.value-1) * 50;
  if (j >= max)
  {
    j = max - (max - 50*Math.round(max/50));
  }

  form_f.inicial.value = j;

  form_f.submit();    

}

function TestaMaximo(form_f, max)
{
  if (form_f.inicial.value > max)
  {
   form_f.inicial.value = max;
  }


  if (form_f.inicial.value < 1)
  {
   form_f.inicial.value = 1;    
  }


  form_f.submit();    

}