//新闻频道展播图片设置
function $(id) {
    return document.getElementById(id);
}
function setTransition() {
    if (document.all) {
        $('imgAd').filters.revealTrans.Transition = Math.floor(Math.random() * 23); //设置图片切换
        $('imgAd').filters.revealTrans.apply(); //应用图片切换                
    }
}
function playTransition() {
    if (document.all)
        $('imgAd').filters.revealTrans.play() //播放图片
}
function changeImg() {
    if (curIndex == arrUrl.length - 1) {
        curIndex = 0;
    }
    else {
        curIndex += 1;
    }
    setTransition();    
    $('imgAd').src = arrUrl[curIndex];    
    $('imgAd').alt = arrAlt[curIndex];
    $('url').href = arrHref[curIndex]; //图片的URL    
    var title='';
    if(curIndex ==0)
        title="<font  style='background-color:Red;'>&nbsp;1&nbsp;</font> "+"&nbsp;2&nbsp;3&nbsp;";
    else if(curIndex == 1)
        title="&nbsp;1&nbsp;"+"<font  style='background-color:Red;'>&nbsp;2&nbsp;</font> "+"&nbsp;3&nbsp;";
    else 
        title="&nbsp;1&nbsp;2&nbsp;"+"<font  style='background-color:Red;'>&nbsp;3&nbsp;</font> ";
    $('spTitle').innerHTML =arrAlt[curIndex];
    $('spNum').innerHTML=title;
    playTransition();
}