Code:
$DB_site->query("
INSERT INTO " . TABLE_PREFIX . "thread(threadid, title, lastpost, forumid, open, replycount, postusername, postuserid, lastposter, dateline,iconid, visible, attach, similar)
VALUES (NULL,'".addslashes(htmlspecialchars($subject))."','".time()."','$forumid','1','0','".addslashes($postusername)."','$bbuserinfo[userid]','".addslashes($postusername)."','".time()."','$iconid','$visible','0')");
$threadid=$DB_site->insert_id();
$DB_site->query("INSERT INTO post (
postid,threadid,title,username,userid,dateline,attachmentid,pagetext,allowsmilie,showsignature,ipaddress,iconid,visible) VALUES (NULL,'$threadid','".addslashes(htmlspecialchars($subject))."','".addslashes($postusername)."','$bbuserinfo[userid]','".time()."','0','".addslashes($message)."','1','1','','0','1')");
$DB_site->query("UPDATE forum SET replycount=replycount+1,threadcount=threadcount+1,lastpost='".time()."',lastposter='".addslashes($postusername)."' WHERE forumid IN ($forumid)");