O que isso faz ? [HELP]

[Reck]

$(document).ready(function(){
	
	function showLoader(){
	
		$('.search-background').fadeIn(200);
	}
	
	function hideLoader(){
	
		$('.search-background').fadeOut(200);
	};
	
	$("#paging_button li").click(function(){
		
		showLoader();
		
		$("#paging_button li").css({'background-color' : ''});
		$(this).css({'background-color' : '#006699'});

		$("#content").load("arquivo.class?pagina=" + this.id, hideLoader);
		
		return false;
	});
	
	$("#1").css({'background-color' : '#006699'});
	showLoader();
	$("#content").load("arquivo.class?pagina=1", hideLoader);
	
});
</script>

alguem pode me dizer ?