/*图片幻灯浏览*/
function easing(t,b,c,d)
{

 var ts=(t/=d)*t;
 var tc=ts*t;
 return b+c*(0.3*tc*ts + 0.01*ts*ts + -1.3*tc + 1.8*ts + 0.1*t);
}
function changeOpacity(obj)   /*渐变透明度的功能函数*/

{
 !+"\v1"?obj.style.filter="alpha(opacity="+easing(t,b,c,d)*100+")":obj.style.opacity=easing(t,b,c,d);
 if(t<d){t+=5;timer=setTimeout(function(){changeOpacity(obj)}),10}
}
function control(index)
{/*决定对哪张图片进行透明度变化的函数，同时还做了按钮样式改变，重置数据等工作，index参数为目标图片和相应的按钮的索引号*/
 clearTimeout(timer);          /*清除先前的动画，避免动画累加*/
 t=0.3;//重置初始时间
 var length=imgs.length;
 for(var i=0;i<length;i++){
  !+"\v1"?imgs[i].style.filter="alpha(opacity=0)":imgs[i].style.opacity=0;/*把所有图片的透明的都设为0*/
  lists[i].className="";                     /*移除按钮的当前样式类*/
  imgs[i].style.zIndex=0;
  }
 lists[index].className="current";           /*给相应的按钮添加样式*/
 imgs[index].style.zIndex=6;
 changeOpacity(imgs[index]);                 /*调用渐变透明的函数*/
}
var timer,delayTimer,autoPlayTimer,autoPlayCount=1,b=0,c=1,t=0.3,d=100;
/*timer为进行渐变动画的定时器，delay为按钮延迟触发的定时器*/
var imgs=document.getElementById('headerimg').getElementsByTagName('img');   /*获取图片元素*/
var lists=document.getElementById('play').getElementsByTagName('li');  /*获取按钮元素*/
for(var i=0;i<lists.length;i++){
 lists[i].onmouseover=clousre(i);                         /*通过闭包注册函数，当然也可以在按钮上一个一个进行注册*/
 lists[i].onmouseout=function(){clearTimeout(delayTimer)}/*延迟触发*/
}
function clousre(i){
 return function(){delayTimer=setTimeout(function(){autoPlayCount=i+1;control(i)},300)}
}
function autoPlay(){/*自动播放函数*/
 autoPlayCount>3?autoPlayCount=0:void(0); 
 autoPlayTimer=setTimeout(function(){control(autoPlayCount);autoPlayCount++;autoPlay()},14000)
}
var imgContainer=document.getElementById('headerimg');
imgContainer.onmouseover=function(){clearTimeout(autoPlayTimer)}/*鼠标移入图片内则停止自动播放*/
imgContainer.onmouseout=function(){autoPlay()}/*鼠标移出图片后继续自动播放*/
autoPlay();

/*小窗口*/

window.onload = getMsg;
window.onresize = resizeDiv;
window.onerror = function(){}
var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,objTimer,i = 0;
function getMsg()
{
 try{
 divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10)
 divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10)
 docWidth = document.body.clientWidth;
 docHeight = document.body.clientHeight;
 document.getElementById("eMeng").style.visibility="visible"
 objTimer = window.setInterval("moveDiv()",10)
 }
 catch(e){}
}

function resizeDiv()
{
 i+=1
 if(i>500) closeDiv()
 try{
 divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10)
 divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10)
 docWidth = document.body.clientWidth;
 docHeight = document.body.clientHeight;
 }
 catch(e){}
}

function moveDiv()
{
 try
 {
 if(parseInt(document.getElementById("eMeng").style.top,10) <= (docHeight - divHeight + parseInt(document.body.scrollTop,10)))
 {
 window.clearInterval(objTimer)
 objTimer = window.setInterval("resizeDiv()",1)
 }
 divTop = parseInt(document.getElementById("eMeng").style.top,10)
 document.getElementById("eMeng").style.top = divTop - 1
 }
 catch(e){}
}
function closeDiv()
{
 document.getElementById('eMeng').style.visibility='hidden';
 if(objTimer) window.clearInterval(objTimer)
}