Redirect links in new window

[CarCdr]

No. The stuff in <if condition="STUFF"> must be well formed PHP.

There are various ways to check that a single value, such as forumid, is a member of a set. Here's one that will work for you:

<if condition="$forum['link'] AND in_array($forum['forumid'], array(12, 15, 22, 26)">

This one means, "If the forum is of type link, then and only then, check that the forumid is one of the ones listed. If both these conditions are true, then include the HTML code.