imap?

I'm using imap_header to get all the headers in a newsgroup on a NNTP-server like this if($nntp=imap_open("{sunsite.auc.dk/nntp:119}dk.admin","","")) { for($i=1;$i<5;$i++) { $header = imap_header($nntp, $i); echo "MESSAGE ID: " . HTMLSpecialChars($header->message_id) . "<BR>\n"; echo "SUBJECT:<a href='visInd.php'>" . $header->Subject . "<br>\n</a>"; echo "SENDER ADDRESS: " . HTMLSpecialChars($header->senderaddress) . "<BR>\n"; echo "REPLY-TO: " . HTMLSpecialChars($header->reply_toaddress) . "<BR>\n"; print("DATE: $header->date<br>\n"); echo "REFERENCES: " . HTMLSpecialChars($header->references) . "<BR>\n"; print("XREF: " . $header->xref) . "<BR>"; } } But I can't get it to write the XREF on the screen. Every thing else works. I hope that you can help me Thanks Shimon