Javascriptym获取服务器端listbox控件的值

            var toid=window.document.getElementById("<%=DDLDepartment.ClientID %>");
           for(ii=0;ii<toid.length;ii++)
           {
                if (toid.options[ii].selected)
                {
                    break;
                }
           }

           
            J.dialog.get( skin, { page: 'other/content/01.aspx?toid='+toid.options[ii].value , skin: skin } );
            alert('other/content/01.aspx?toid='+toid.options[ii].value);