[SiK GambleR]

<if condition="is_member_of($post, 6)">
<div id="post_message_$post[postid]" style="color: yellow;">
<else />
<div id="post_message_$post[postid]">
</if>

That forced my text to be yellow, but for some reason, all of my post content was removed, from every post. It came back when I put the original code back, though.