[JD45]

Ok, I got it working and here's how:

You need to upload the contents of the attached file (image and script) to your forums root directory.

Second modify header not headinclude like a previous poster had mentioned.

Here's how my header template code looks like:

<if condition="$bbuserinfo['field5']==YES">
<script type="text/javascript" src=" /forum/script/snowstorm.js"></script>
</if>

You can see a live demo at:

http://www.justpressplay.net/forum/

Edit: well, since it's a user option you won't be able to see it unless you register.