Hide button post thanks

[4ngeluxpunk]

Good, I wish you can help me with the following I'm trying to hide the post thank button postbit_legacy to certain user groups and certain forums using conditional, but can not get it to work, and treated with the following sentence but I disappears the button at all forums.

<vb:if condition="!is_member_of($bbuserinfo, X,Y)">
{vb:raw template_hook.postbit_controls}   //Do not show X, Y

<vb:elseif condition="$forum[forumid] != x" />
{vb:raw template_hook.postbit_controls}  //Do not show in X forum

<vb:else />
{vb:raw template_hook.postbit_controls}  //Show all groups and in all other forums

</vb:if>

I wish I can help with that sentence that I can not make it work.

Thank you.