HtmlArea as Editor - designMode raises an unknow error

Hi,

I am using Mozilla ActiveX Control.

I am trying to open an page that contains an HTML editor.

In firefox works great, but it embedded one no.

Seens to be some configuration/security problem, since the error
occurs exaclty in javascript code when designMode property is being
set to "on".

Any feedback is highly appreaciated.

Thanks,

Vitor