//主函数
var s1 = function() {
    try {
        var interv = 5000; //切换间隔时间
        var interv2 = 1; //切换速速
        var opac1 = 0; //文字背景的透明度
        var source = "fade_focus1" //焦点轮换图片容器的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_v2";
        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 = "liehuo_b1";
            a.onmouseover = function() {
                this.className = "liehuo_b2"
            };
            a.onmouseout = function() {
                this.className = "liehuo_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 = "liehuo_b1"
            };
            button.childNodes[n].className = "liehuo_b2";
        }
        title.className = "num_list";
        title.appendChild(span);
        alpha(title, opac1);
        id.className = "liehuo_d1_v2";
        div.className = "liehuo_d2_v2";
        id.appendChild(div);
        id.appendChild(title);
        id.appendChild(button);
        //渐显
        var fadeon = function() {
            opac += 20;
            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 -= 20;
            div.innerHTML = li[j].innerHTML;
            alpha(div, opac);
            if (scton == 0) {
                num = 2;
                scrolltxt();
                scton = 1
            };
            if (opac > 0) {
                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();
    }
    catch (e)
    { }
}
//初始化
//window.onload = s1;