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(function () {
 
		jQuery('#top_menu li a').on('click', function(){
			var item = $(this).parent().attr('class'),
				tar = $(this).attr('data');
 
			$("html, body").animate({ scrollTop: jQuery(tar).offset().top }, 1000);
		});		
		
	})()
	
// 	<li class="item-0"><a href="#begin" 	 data=".header1" 	  class="root-item">В начало</a></li>