ie8下window.open问题

jsp里面的链接 
<a href="#"  onclick='MM_openBrWindow("?optionid=11111&item=2013&studentid=${CarProuct.studentId}&testid=${CarProuct.testId}&sele=1&examName=${CarProuct.examName}&test_Date=${CarProuct.examDate}",
"testid=${CarProuct.testId}&subject_name=${CarProuct.subjectName}",this);'>调用js里面的MM_openBrWindow
function MM_openBrWindow(theURL, winName, obj) { //v2.0
        var url = "${pageContext.request.contextPath}/onceTestAnalyse.do?method=getPaperVO&" + winName;
        // alert(url);
        var returnstr = sendHaveParameterCrossPlatform(url, "");
        theURL = '${pageContext.request.contextPath}/b2cIndex/reporttwo/index.jsp' + theURL;
        alert(theURL);
        window.open(theURL, "", 'fullscreen=yes,Status=yes,scrollbars=yes,resizable=yes');
        
        //window.open(theURL);
        //window.open("", "", 'fullscreen=yes,Status=yes,scrollbars=yes,resizable=yes');
        //obj.href=theURL;
    }
    function sendHaveParameterCrossPlatform(URL, parameter) {
        var strReturn = null;
        
        var xmlHttp = new Ajax.Request(
                URL,
        {
            method:'post',
            contentType:'application/x-www-form-urlencoded;charset=GBK',
            asynchronous:false
        });
       if (xmlHttp.transport.readyState == 4) {
            if (xmlHttp.transport.status == 200) {
                strReturn = xmlHttp.transport.responseText;
            }
       }else {
            alert("网络异常,请稍候再试!");
        }
        return strReturn;
    }
点击链接是没有反应，ie8上返回的错误信息是：没有注册类别
onceTestAnalyse.do
code：0
URL：http://localhost:8888/b2c/onceTestAnalyse.do?method=initLevelExamList