fckeditor 上传图片动态返回问题

页面调用fckeditor                 
                <textarea id="content" name="content"></textarea>
                <script type="text/javascript">
                    var oFCKeditor = new FCKeditor('content') ;
                    oFCKeditor.BasePath = "../../fckeditor/";
                    oFCKeditor.Width='95%';
                    oFCKeditor.Height = 300;
                    oFCKeditor.ToolbarSet = "Sjswsbs";
                    oFCKeditor.ReplaceTextarea();                    
                </script>fckeditor 点击执行returnvalue = F.showModalDialog(winStr,"","font-family:Verdana;font-size:12;dialogWidth:610px; dialogHeight:300px;status:yes;scrollbars=yes");            var oEditor = FCKeditorAPI.GetInstance('content');//这里怎么动态获取实例名
            
            if ( oEditor.EditMode == FCK_EDITMODE_WYSIWYG )
            {
                var url;        
                var filename;
                var returnval="";
             if (returnvalue!=null && returnvalue!=""){
                var arr = new Array();
                var filearr = new Array();
                arr = returnvalue.split("|||||");
                    url = arr[0];
                    filename = arr[1];
                    filearr = filename.split("-----");
                    //alert(filearr.length);
                    for(var j = 1; j < filearr.length; j++){
                        returnval += "<br><img src=\"" + url + filearr[j] +"\" border=\"0\">";
                    }
                    oEditor.InsertHtml(returnval) ;
                    //oEditor.InsertHtml("<img src=\"" + returnvalue + "\" border=\"0\">") ;
                }
            }fckeditor图片