Trying to update post table via posting.php

[mADmAX`]

I am trying to open/close posts via a button in postbit template. This will not do as open/close thread does but simply do a permission via some other things. I know I dont make sense on what I am gonna be using it for but how do you update the post table (openclose field) via postting.php.

I cant figure out how to make it pull the postid or find it. Not sure actually whats wrong with it. Any help is appreciated.

// ############################### start do open/close posts ###############################
if ($HTTP_POST_VARS['action']=="openclosepost") {

$postid = verifyid("post",$postid);
$postinfo=getpostinfo($postid);

if ($bbuserinfo[usergroupid]==5 or $bbuserinfo[usergroupid]==6 or $bbuserinfo[usergroupid]==16) {
if ($postinfo[openpost]==1) {
$DB_site->query("UPDATE post SET openpost=0 WHERE postid='$postinfo[postid]'");
eval("standardredirect(\"".gettemplate("redirect_t hreadclosed")."\",\"showthread .php?s=$session[sessionhash]&threadid=$threadid\");");
}
if ($postinfo[openpost]==0) {
$DB_site->query("UPDATE post SET openpost=1 WHERE postid='$postinfo[postid]'");
eval("standardredirect(\"".gettemplate("redirect_t hreadopen")."\",\"showthread.p hp?s=$session[sessionhash]&threadid=$threadid\");");
}
}
}