var speed = 7000;  //切换时间
var img= new Array();
//var url= new Array();
var current = 0; 

//图片定义
img[0] = "imgs/bg_index_pic1.jpg";
img[1] = "imgs/bg_index_pic2.jpg";
img[2] = "imgs/bg_index_pic3.jpg";
img[3] = "imgs/bg_index_pic4.jpg";
img[4] = "imgs/bg_index_pic5.jpg";
img[5] = "imgs/bg_index_pic6.jpg";
img[6] = "imgs/bg_index_pic.jpg";
window.onload = start;

function start() 
{
  setTimeout("change()",speed);
}

function change()
{
var obj=document.getElementById("test");
if(current >=img.length) current = 0;

var url="url(" + img[current]+ ")";
with(obj.filters.revealTrans)
{
apply(); //捕获对象内容的初始显示，为转换做必要的准备
transition=23; //revealTrans滤镜的转换效果，0到22为23种效果，23为23种效果的随机一种
obj.style.backgroundImage=url; //设置图片的路径
play(); //开始转换。
}
current++;
setTimeout("change()",speed);
}