function mostraPeus()
{
  var html = '';
  c = document.getElementsByTagName('span');
  for(a = 0;a < c.length;a++)
  {
    if (c[a].className == 'per_imprimir')
    {
      html = html + c[a].innerHTML +"<br/>"; 
    }
  }
  
  p = document.getElementById('peus_pagina');
  p.innerHTML = html;
}