判断IE8

var browser=navigator.appName;
    var panduan_hide='style="display:none;"';
    if(browser=="Microsoft Internet Explorer"){
        var b_version=navigator.appVersion;
        var version=b_version.split(";");
        var trim_Version=version[1].replace(/[ ]/g,"");
        if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE8.0")
        {
            panduan_hide='';
        }
    }