function $(obj){return document.getElementById?document.getElementById(obj):null;}


function ChangeDivs(N,k){// 跳转
	for(i=0;i<N;i++){
		$("Spe"+i).className="Special_notin_first";
		$("Special"+i).style.display="none";

	}
		$("Spe"+k).className="Special_in";
		$("Special"+k).style.display="";

}

function SwitchBG(cid,aid)
{
	var Spe = new Array(aid);   //按钮数组
	var Special = new Array(aid);  //专辑数组
	Spe[0] = document.getElementById("Spe0");
	Spe[1] = document.getElementById("Spe1");
	Spe[2] = document.getElementById("Spe2");
	Spe[3] = document.getElementById("Spe3");
	Spe[4] = document.getElementById("Spe4");

	Special[0] = document.getElementById("Special0");
	Special[1] = document.getElementById("Special1");
	Special[2] = document.getElementById("Special2");
	Special[3] = document.getElementById("Special3");
	Special[4] = document.getElementById("Special4");
	for(var i=0;i<aid;i++)
	{
		if(cid==i)
		{
			if(cid==0)
			{
				Spe[i].className = "Special_in_first";
			}
			else
			{
				Spe[i].className = "Special_in";
			}
			Special[i].style.display = "";
		}
		else
		{
			if(i==0)
			{
				Spe[i].className = "Special_notin_first";
			}
			else
			{
				Spe[i].className = "Special_notin";
			}
			Special[i].style.display = "none";
		}
	}	
}

var i=0;
var s=0;
function set(i)
{
	if(s>3)
	{
		s=0;
		SwitchBG(s,5);	
		
	}
	else
	{
		s=s+i+1;
		SwitchBG(s,5);	
	}
	
}

function go()
{
	setInterval("set("+i+")",8000);
	
}
go();