var isScroll = true;
var t = 8000;
var n = 0;
var i = 0;
var s;
var timer;

function changeMallItem(id, linkid) {
    var obj = document.getElementById(id);
    var goodsItem = document.getElementById("goodsinfo");
    goodsItem.innerHTML = obj.innerHTML;
    i = i + 20; //逐渐显示速度
    goodsItem.style.filter = "Alpha(Opacity=" + i + ")"; //透明度逐渐变小
    goodsItem.style.opacity = i / 100; //兼容FireFox
//    goodsinfo.style.width = 532 + "px"; //宽度逐渐变大		
    if (i >= 100) {
        clearInterval(s);
        i = 0;
    }
    curBtn(linkid);
}

function scrollItem() {
    var obj = document.getElementById("shopbtn_block");
    var link = obj.getElementsByTagName("A");
    if (n > link.length - 1) return;
    var goodsid = "goods0" + (n + 1);
    show(goodsid, link[n].id);
    n++;
}

function ShowItem() {
    scrollItem();
    //timer = setInterval("scrollItem(n)", t);
}

function curBtn(curid) {
    var obj = document.getElementById("shopbtn_block");
    var link = obj.getElementsByTagName("A");
    for (var i = 0; i < link.length; i++) {
        if (link[i].id == curid) {
            link[i].className = "gray shop_btn_focus";
        }
        else {
            link[i].className = "gray shop_btn";
        }
    }
}

function JInterval(funcName, time) {
    var args = [];
    for (var i = 2; i < arguments.length; i++) {
        args.push(arguments[i]);
    }
    return window.setInterval(function() {
        funcName.apply(this, args);
    }, time);
}

function show(id, linkid) {
    if (s) {
        clearInterval(s);
    }
    s = JInterval(changeMallItem, 3, id, linkid);
}