判断浏览器类型

<script type="text/javascript">
    //------------判断浏览器-----------
    var Sys = {};
    var ua = navigator.userAgent.toLowerCase();
    var s;
    (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
        (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
        (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
        (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
        (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;
    //------------判断浏览器-----------


    if (Sys.ie) document.write(‘IE: ‘ + Sys.ie);
    if (Sys.firefox) document.write(‘Firefox: ‘ + Sys.firefox);
    if (Sys.chrome) document.write(‘Chrome: ‘ + Sys.chrome);
    if (Sys.opera) document.write(‘Opera: ‘ + Sys.opera);
    if (Sys.safari) document.write(‘Safari: ‘ + Sys.safari);
</script>

    protected string BrowType = "ie";

    protected void Page_Load(object sender, EventArgs e)
    {
        System.Web.HttpBrowserCapabilities browser = Request.Browser;
        BrowType = browser.Browser.ToLower();
    }

                <%if (!(BrowType == "ie" || BrowType == "safari"))
                  {
                %>
                      <div style="height:40px;"></div>
                <% 
                  } 
                %>