//加入收藏夹代码
function addBookmark() {
    var title = '中广互联 - SARFT.net | 中国广电第一门户 | 数字电视行业第一门户';
    var url = 'http://www.sarft.net';
    var desc = '中国广播电视领域最权威的行业门户网站';
    if (window.sidebar) {
        window.sidebar.addPanel(title, url, desc); //Mozilla browser  
    } else if (document.all) { //IE browser  
        window.external.AddFavorite(url, title);
    } else if (window.opera && window.print) { //Not Support Now  
        return true;
    }
}

//设为首页代码
function setHomepage() {
    if (document.all) {
        document.body.style.behavior = 'url(#default#homepage)';
        document.body.setHomePage('http://www.sarft.net');
    } else if (window.sidebar) {
        if (window.netscape) {
            try {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            }
            catch (e) {
                alert("Firefox暂无此功能，请手动设置。");
            }
        }
        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
        prefs.setCharPref('browser.startup.homepage', 'http://www.sarft.net');
    }
}

//滚动到顶部
function goTop(acceleration, time) {
    acceleration = acceleration || 0.1;
    time = time || 16;

    var x1 = 0;
    var y1 = 0;
    var x2 = 0;
    var y2 = 0;
    var x3 = 0;
    var y3 = 0;

    if (document.documentElement) {
        x1 = document.documentElement.scrollLeft || 0;
        y1 = document.documentElement.scrollTop || 0;
    }
    if (document.body) {
        x2 = document.body.scrollLeft || 0;
        y2 = document.body.scrollTop || 0;
    }
    var x3 = window.scrollX || 0;
    var y3 = window.scrollY || 0;

    // 滚动条到页面顶部的水平距离
    var x = Math.max(x1, Math.max(x2, x3));
    // 滚动条到页面顶部的垂直距离
    var y = Math.max(y1, Math.max(y2, y3));

    // 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
    var speed = 1 + acceleration;
    window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));

    // 如果距离不为零, 继续调用迭代本函数
    if (x > 0 || y > 0) {
        var invokeFunction = "goTop(" + acceleration + ", " + time + ")";
        window.setTimeout(invokeFunction, time);
    }
}