// JScript 文件
/*
by: /
*/
//主函数
var s=function(){
    var interv=3500; //切换时间
    var interv2=25; //切换速速
    var opac1=70; //文字背景的透明度
    var source="newsPic" //图片容器的id名称
    //获取对象
    function getTag(tag,obj)
        {
            if(obj==null)
                {return document.getElementsByTagName(tag)}
            else
                {return obj.getElementsByTagName(tag)}
        }
    function getid(id){return document.getElementById(id)};
    var opac=0,j=0,t=63,num,scton=0,timer,timer2,timer3;
    var id=getid(source);id.removeChild(getTag("div",id)[0]);
    var li=getTag("li",id);var div=document.createElement("div");
    var title=document.createElement("div");
    var span=document.createElement("span");
    var button=document.createElement("div");
    button.className="button";
    for(var i=0;i<li.length;i++)
        {
            var a=document.createElement("a");
            a.innerHTML=i+1;
            a.onclick=function()
                {
                    clearTimeout(timer);
                    clearTimeout(timer2);
                    clearTimeout(timer3);
                    j=parseInt(this.innerHTML)-1;
                    scton=0;t=63;opac=0;fadeon();
                };
            a.className="b1";
            a.onmouseover=function(){this.className="b2"};
            a.onmouseout=function(){this.className="b1";sc(j)};button.appendChild(a);}
    //控制图层透明度
    function alpha(obj,n){if(document.all){obj.style.filter="alpha(opacity="+n+")";}else{obj.style.opacity=(n/100);}}
    //控制焦点按钮
    function sc(n){for(var i=0;i<li.length;i++){button.childNodes[i].className="b1"};button.childNodes[n].className="b2";}
    title.className="num_list";title.appendChild(span);alpha(title,opac1);id.className="d1";div.className="d2";id.appendChild(div);id.appendChild(title);id.appendChild(button);
    //渐显
    var fadeon=function(){opac+=4;div.innerHTML=li[j].innerHTML;span.innerHTML=getTag("img",li[j])[0].alt;alpha(div,opac);if(scton==0){sc(j);num=-2;scrolltxt();scton=1};if(opac<100){timer=setTimeout(fadeon,interv2)}else{timer2=setTimeout(fadeout,interv);};}
    //渐隐
    var fadeout=function(){opac-=3;div.innerHTML=li[j].innerHTML;alpha(div,opac);if(scton==0){num=2;scrolltxt();scton=1};if(opac>20){timer=setTimeout(fadeout,interv2)}else{if(j<li.length-1){j++}else{j=0};fadeon()};}
    //滚动文字
    var scrolltxt=function(){t+=num;span.style.marginTop=t+"px";if(num<0&&t>3){timer3=setTimeout(scrolltxt,interv2)}else if(num>0&&t<62){timer3=setTimeout(scrolltxt,interv2)}else{scton=0}};
    fadeon();
}
window.onload=s;