后台cs输出div屏蔽页面，总是报错

代码是这样的
public void ShowDiv()
    {
        string strDiv = @"<div id='divCitylist'><div class='divBackgroundFilter' id='divConver'></div><div style='position: absolute;' id='div99' class='divContent'><div onmousedown='divDrag('div99');' id='div55' style='width: 100%; cursor: hand;                      text-align: right; background-color: #efefef;'> &nbsp;&nbsp;<input type='image' alt='Close' src='../images/dialogclose2.gif' onclick='$('#divCitylist').hide();' /></div><div id='CityContent'></div> </div> </div>";
  
        Page.ClientScript.RegisterStartupScript(this.GetType(), "showdiv", string.Format(@"
            $(""{0}"").appendTo(body);
            $('#divConver').height($(document).height());
            $('#divConver').width($(document).width());
            document.getElementById('div99').style.top = '200px';
            document.getElementById('div99').style.left = '200px';
            $('#divCitylist').show();",strDiv)
            , true);    }
总是说缺少对象，什么错误呢