$(document).ready(function(){
  $('.menu a, .block_cena, .block_text5 ul li').each(function(){
     $(this).textDropShadow('shadow')
  });
});

(function($) {
$.fn.textDropShadow = function(ShdwClass){
  $(this).css('position','relative').html('<span class='+ShdwClass+'>'+$(this).html()+'</span><span style="position:relative;">'+$(this).html()+'</span>');
  return $(this);
}
})(jQuery);