$(function(){
	var jm=$(".jm").children("li");
	var arr=["0,1,2,3","4,5,6,7","8,9,10,11","12,13,14,15","16,17,18,19","20,21,22,23"];
	var index = 0; //当前默认索引
	var timer = setInterval(function(){
		HideList();
		var arr2 = arr[index].split(',');
		for(z=0;z<arr2.length;z++){
			jm.eq(arr2[z]).slideDown(500);
		}
		if(index==2){index=-1};
		index++;
	},3000)
	//FN
	function HideList()
	{
		jm.each(function(){
			$(this).hide();
		});		
	}
});