Added big note saying 'please disable security before trying to run
this' so nobody gets frustrated.
Updated sample component progid reference to actually match the .cpp.
Now the page actually works! (John Morrison
<3jrgm@qlink.queensu.ca> caught this in mozilla.xpcom)
Thanks to Rick Bradley <roundeye@bellsouth.net> for pointing me to the
problem, and for encouraging me to add a note.
r=mccabe. Not part of the build.