java打印功能在ie6下失效的问题

function Printpart(id_str)//id-str 内容中的id

          {

                var el = document.getElementById(id_str);

                var iframe = document.createElement('IFRAME');

                var doc = null;

                iframe.setAttribute('style', 'position:absolute;width:0px;height:0px;left:-500px;top:-500px;');

                document.body.appendChild(iframe);

                doc = iframe.contentWindow.document;

                doc.write('<div>' + el.innerHTML + '</div>');

                doc.close();

                iframe.contentWindow.focus();

                iframe.contentWindow.print();

                if (navigator.userAgent.indexOf("MSIE") > 0)

                {

                     document.body.removeChild(iframe);

                }

                return false;

          }

ie6提示脚本错误
URL:xxx/6hdoclc/preview.dlg
------解决方案--------------------
IE6太老了，不必为它再兼容吧