var isNeweraStart=true;
var isDceStart=true;
var isShfeStart=true;
var isZceStart=true;
var nn=0;
var tt;
var maxnn = 3*4*5;

//setTimeout('change_img()',4000);
//alert("¿ªÊ¼À²£¡");
function change_img()
{
	nn++;
	if(nn>maxnn) nn=1;
	if(isNeweraStart)	selectLayer("newera",nn,2);
	if(isDceStart)	selectLayer("dce",nn,4);
	if(isShfeStart)	selectLayer("shfe",nn,4);
	if(isZceStart)	selectLayer("zce",nn,5);
	tt=setTimeout('change_img()',4000);
}


function selectLayer(tagname,i,ntag)
{
	for(j=0;j<ntag;j++)
	{
		h=j+1
		k=j+2
		if(j==i%ntag)
		{
			if(j>0)
			{
				document.getElementById(tagname + "_p" + j).style.background="url('images/bbs_sl_p4.jpg')";
			}
			document.getElementById(tagname + "_t" + h).style.background="url('images/bbs_sl_p3.jpg')";
			document.getElementById(tagname + "_p" + h).style.background="url('images/bbs_sl_p2.jpg')";
			document.getElementById(tagname + "_t" + h).style.borderBottom="";
			document.getElementById(tagname + "_p" + h).style.borderBottom="";
			document.getElementById(tagname + "_s" + h).style.display="block";
		}
		else
		{
			if(j>0&&j<ntag-1&&j!=(i%ntag+1))
			{
				document.getElementById(tagname + "_p" + j).style.background="url('images/bbs_sl_p1.gif')";
			}
			document.getElementById(tagname + "_t" + h).style.background="";
			document.getElementById(tagname + "_p" + h).style.background="url('images/bbs_sl_p1.gif')";
			document.getElementById(tagname + "_t" + h).style.borderBottom="#c3c3c3 1px solid";
			document.getElementById(tagname + "_p" + h).style.borderBottom="#c3c3c3 1px solid";
			document.getElementById(tagname + "_s" + h).style.display="none";
		}
	}
}

function showme(tagname,index)
{
	switch(tagname)
	{
		case "newera" :
			isNeweraStart=false;
			selectLayer(tagname,index,2);
			break;
		case "dce" :
			isDceStart=false;
			selectLayer(tagname,index,4);
			break;
		case "shfe" :
			isShfeStart=false;
			selectLayer(tagname,index,4);
			break;
		case "zce" :
			isZceStart=false;
			selectLayer(tagname,index,5);
			break;
		default :
			break;
	}
}

function autoplay(tagname)
{
	switch(tagname)
	{
		case "newera" :
			isNeweraStart=true;
			break;
		case "dce" :
			isDceStart=true;
			break;
		case "shfe" :
			isShfeStart=true;
			break;
		case "zce" :
			isZceStart=true;
			break;
		default :
			break;
	}
}