// JScript 文件
var currentpic = 1
var lastpic = 1
var MaxNumber = 5

function switchpcon(picid){	
	currentpic=picid
	document.getElementById("dpic"+currentpic).style.display="block";
	document.getElementById("dtext"+currentpic).style.display="block";
	document.getElementById("pn"+currentpic).className="linkaact";
	if(lastpic != currentpic){
	closeopen()}
}

function closeopen() 
{
	//alert(prevpic);
	document.getElementById("dpic"+lastpic).style.display="none";
	document.getElementById("dtext"+lastpic).style.display="none";
	document.getElementById("pn"+lastpic).className="linka";
	lastpic = currentpic;
	arrowctrl()
}
function nextpic(){
	var nexpicID=currentpic+1
		if(currentpic==MaxNumber){
		nexpicID=1
		}
	switchpcon(nexpicID)
}

function prevpic(){
	var prevpicID=currentpic-1
	switchpcon(prevpicID)	
}


function arrowctrl()
{
	if(currentpic!=1)
	{
		document.getElementById("pageleft1").style.display="block"
		document.getElementById("pageleft2").style.display="none"
	}
	else{
		document.getElementById("pageleft1").style.display="none"
		document.getElementById("pageleft2").style.display="block"
		}
			if(currentpic!=MaxNumber)
	{
		document.getElementById("pageright1").style.display="block"
		document.getElementById("pageright2").style.display="none"
	}
	else{
		document.getElementById("pageright1").style.display="none"
		document.getElementById("pageright2").style.display="block"
		}
		
}
var apmethor
function autoplay(){
	document.getElementById("autoplay").style.display="none"
	document.getElementById("playstop").style.display="block"	
	apmethor = setInterval("nextpic()", 3000)
}

function playstop(){
	document.getElementById("autoplay").style.display="block"
	document.getElementById("playstop").style.display="none"	
	clearInterval(apmethor)
}