var NowImg = {};
var bStart = 0;
var bStop =0;
function fnToggle(ind) {
var imgTab1 = document.getElementById('imgTab'+ind);
var divs=document.getElementById("imgTab"+ind).getElementsByTagName("DIV"); // 获取img的个数
MaxImg=divs.length
    if (!NowImg['a'+ind]){
        NowImg['a'+ind]=1;
    }
    var next = NowImg["a"+ind] + 1;
    if(next == MaxImg+1) 
    {
        NowImg["a"+ind] = MaxImg;
        next = 1;
    }
    if(bStop!=1)
    {
        if(bStart == 0)
        {
            bStart = 1;     
            setTimeout('fnToggle('+ind+')', 4000);
            return;
        }
        else
        {
            imgTab1.filters[0].Apply();
            document.getElementById("oDIV"+ind+next).style.display = "";
            document.getElementById("oDIV"+ind+NowImg['a'+ind]).style.display = "none"; 
            imgTab1.filters[0].Play(duration=2);

            if(NowImg['a'+ind] == MaxImg) 
                NowImg['a'+ind] = 1;
            else
                NowImg['a'+ind]++;
        }
        setTimeout('fnToggle('+ind+')', 4000);
    }
}

function toggleTo(img)
{var ts=document.getElementById("imgTab1").getElementsByTagName("DIV");//获取img的个数
    bStop=1;  // 这个的作用是停止自动轮显。如果去掉。会发生很有意思的现象。。想知道？自己试试嘛～
    for(i=1;i<ts.length+1;i++){
    if(img==i){
        document.getElementById ("oDIV"+i).style.display = "";
        }
    else{
    document.getElementById ("oDIV"+i).style.display = "none";
        }
    }
}
window.onload=function(){fnToggle(1);fnToggle(2);}