右侧浮动客服纯JS插件（兼容）

//在线客服，浮动于浏览器窗口右侧中部
//调用示例：initCustomerService("CustomerServiceContainer", 100, 300);
function initCustomerService(elelmentId, width, height) {
    var element = document.getElementById(elelmentId);

    if (isIE6()) {
        document.body.style.backgroundImage = "url(about:blank)";
        document.body.style.backgroundAttachment = "fixed";
        element.style.position = "absolute";
        element.style.top = document.documentElement.scrollTop + (document.documentElement.clientHeight - height) / 2 + "px";
        element.style.right = "0px";
        element.style.width = width + "px";
        element.style.height = height + "px";

        window.onscroll = function() {
            initCustomerService(elelmentId, width, height);
        }

        window.onresize = function() {
            initCustomerService(elelmentId, width, height);
        }
    } else {
        element.style.position = "fixed";
        element.style.top = "45%";
        element.style.right = "0px";
        element.style.width = width + "px";
        element.style.height = height + "px";
        element.style.marginTop = height / 2 * -1 + "px";
        element.style.marginBottom = height / 2 * -1 + "px";
    }
}

function isIE6() {
    var browser = navigator.appName;
    var b_version = navigator.appVersion;
    var version = b_version.split(";");
    var trim_Version = version[1].replace(/[ ]/g, "");

    if (browser == "Microsoft Internet Explorer" && trim_Version == "MSIE6.0") {
        return true;
    } else {
        return false;
    }
}