function zalozky_anim() {
  if($('#header_l_menu_in').css('opacity')<=0){
    $('#header_l_menu_in').css({opacity: 0.0}).delay(5000).animate({opacity: 1.0}, 1000  );
    $('#header_r_menu_in').css({opacity: 0.0}).delay(5000).animate({opacity: 1.0}, 1000, zalozky_anim );
  }else{
    $('#header_l_menu_in').css({opacity: 1.0}).delay(5000).animate({opacity: 0.0}, 1000 );
    $('#header_r_menu_in').css({opacity: 1.0}).delay(5000).animate({opacity: 0.0}, 1000, zalozky_anim );

  }
}