replace
AND threadid=$threadid

with
AND threadid=$threadinfo[threadid]

...

I get the same error. I don't know why weird. What else can we do?

I foudn the error Xenon.

This line needs to be in there as well.

$getfirst=$DB_site->query_first("SELECT postid,post.userid,dateline,user.username FROM post LEFT JOIN user USING(userid) WHERE threadid='$threadid' ORDER BY dateline LIMIT 1");

because when u look at ur new code at this line

!strstr(strtoupper($message),strtoupper($getfirst['username']))) {

$getfirst has no where to look for. So i put that code above and it worked.

Is this right though or is there an easier better what of doing it?

yes it has to be there, i thought it would be there already, that's why i didn't mention it again..