function getHTTPBody($soapmsg) {
		if (count($this->responseAttachments) > 0) {
			$params['content_type'] = 'multipart/related; type="text/xml"';
			$mimeMessage = new Mail_mimePart('', $params);
			unset($params);

			$params['content_type'] = 'text/xml';
			$params['encoding']     = '8bit';
			$params['charset']      = $this->soap_defencoding;
			$mimeMessage->addSubpart($soapmsg, $params);
			
			foreach ($this->responseAttachments as $att) {
				unset($params);

				$params['content_type'] = $att['contenttype'];
				$params['encoding']     = 'base64';
				$params['disposition']  = 'attachment';
				$params['dfilename']    = $att['filename'];
				$params['cid']          = $att['cid'];

				if ($att['data'] == '' && $att['filename'] <> '') {
					if ($fd = fopen($att['filename'], 'rb')) {
						$data = fread($fd, filesize($att['filename']));
						fclose($fd);
					} else {
						$data = '';
					}
					$mimeMessage->addSubpart($data, $params);
				} else {
					$mimeMessage->addSubpart($att['data'], $params);
				}
			}

			$output = $mimeMessage->encode();
			$mimeHeaders = $output['headers'];
	
			foreach ($mimeHeaders as $k => $v) {
				$this->debug("MIME header $k: $v");
				if (strtolower($k) == 'content-type') {
					// PHP header() seems to strip leading whitespace starting
					// the second line, so force everything to one line
					$this->mimeContentType = str_replace("\r\n", " ", $v);
				}
			}
	
			return $output['body'];
		}

		return parent::getHTTPBody($soapmsg);
	}