yeah, i had this working, and its nto a pligin, i used the <if> tags ^^
i put this in my header
Code:
<if condition="$forumid == 7">
<style type="text/css">
<!--
body {
background-image: url(../forum/folder/image2.jpg);
background-attachment: fixed;
}
-->
</style>
</if>
<if condition="$forumid == 13">
<style type="text/css">
<!--
body {
background-image: url(../forum/folder/image2.jpg);
background-attachment: fixed;
}
-->
</style>
</if>