Actually I’ve found what causes the problem but i don’t know how to solve.
The script unity3d uses to embed its player uses [removed] (note that I entered the slash in document in order to be displayed in the post).
How can I enter {} inside [removed]?
if (DetectUnityWebPlayer()) {
d/ocument.write('<object id="UnityObject" classid="clsid:444785F1-DE89-4295-863A-D46C3A781394" width="882" height="500"> \n');
d/ocument.write(' \n');
d/ocument.write(' <embed id="UnityEmbed" src="{cf_cc_unity3d}" width="882" height="500" type="application/vnd.unity" pluginspage="http://www.unity3d.com/unity-web-player-2.x" /> \n');
d/ocument.write('</object>');
}