$('#overlay, .fechar').click(function (){
  $('#popup, #overlay').fadeOut();
  $('select').css('visibility', 'visible');
});
$('#abre_popup').click(function (){ 
  $('select').css('visibility', 'hidden');
  sizes = getPageSizes();
  $('#overlay').css({width: sizes.pageW, height: sizes.pageH}).fadeIn(400, function(){
    $('#popup').css({top: 45 + sizes.scrollY}).show();
  });
  return false;
});
$(window).scroll(function (){ 
  sizes = getPageSizes();
  $('#popup').css({top: 60 + sizes.scrollY});
});
$(window).resize(function (){ 
  sizes = getPageSizes();
  $('#overlay').css({width: sizes.pageW, height: sizes.pageH});
});