// JavaScript Document
 var n = 0,speed = 3000,wid
var pics,Links,tips
var picsAry,LinksAry,tipsAry
pics = "images/img1.jpg|images/img2.jpg|images/img3.jpg|images/img4.jpg|images/img5.jpg|images/img6.jpg"
Links= escape("#|#|#|#|#|#")
tips = "|||||"
picsAry = pics.split("|")
LinksAry = Links.split("|")
tipsAry = tips.split("|")
alpahFX = 0,alpahIE = 0
function setAlpha(){  // 明度设置函数
	var o = document.getElementById('photo');
	if (!isNaN(o.style.opacity)) 
	{ 
	  // 如果是fireFox
	  o.style.opacity = alpahFX++ / 20;
	  if (alpahFX > 20)
	   {
 		 alpahFX = 0
		 return
	   }
	}
	else  
	{
	    // 如果是IE
		alpahIE =  alpahIE + 5
		o.filters.alpha.opacity = alpahIE; 
	    if(alpahIE >= 100) 
		{
		   alpahIE = 0
		   return 
		}
	}
	window.setTimeout("setAlpha()",30)
}

function autoPlay()
{
    var as
	document.getElementById("photo").src = picsAry[n]
	document.getElementById("photo").alt=tipsAry[n]
	document.getElementById("picLink").href=LinksAry[n]
	document.getElementById("desc").innerHTML = tipsAry[n]
	setAlpha()
    as = document.getElementById("num").getElementsByTagName("a")
	for(i=0;i<as.length;i++)
	{
	  as[i].className = ""
      as[i].value = i
      as[i].onclick= function ()
	  {
	     window.clearInterval(wid)
		 n = this.value
		 autoPlay()
         wid = window.setInterval("autoPlay()",speed)
	  }
	}
	as[n].className = "current"
	n++
	if (n>=as.length)
	{
	   n = 0
	}
}
function init()
{
  var temp = ""
  for(i=1;i<=picsAry.length;i++)
  {
    temp = temp +  "<li><a href=\"javascript:void(0)\">" + i + "</a></li>\n"
  }
  // alert(temp)
  document.getElementById("num").innerHTML = temp
  autoPlay()
  wid = window.setInterval("autoPlay()",speed)
}

window.onload = init