num = 20;
is_loading = false;
$(function(){
	$(window).scroll(function(){
		var scrollTop = $(this).scrollTop();   
		var scrollHeight = $(document).height();
		var windowHeight = $(this).height();
		if(scrollTop + windowHeight >= scrollHeight - 200 && !is_loading){
			is_loading = true;
			$('#lodingPic').show();

			var id="286";
			
			setTimeout("is_loading = false", 2000);

			$.getJSON("http://m.cheaa.com/ajax_list_more.php?action=more_new&id="+id+"&num="+num,function(a){
				$('#newsList').append(a); 
				num += 20;
				$('#lodingPic').hide();
			});

	　　}
	});
});