[jQuery] Plugin released: textify. PROBLEMS UNSOLVED

[jQuery] Plugin released: textify. PROBLEMS UNSOLVED

Hi everyone.
Finally I'm releasing the plugin I've been so busy developing in the last month. <a href="http://scriptinverse.com/textify/">Textify (see homepage)</a> It's a function that transforms a regular iFrame element into a text editor and I hope it will serve everyone who needs it well. Think of all the possibilities: email applications, blog, forums, maybe chats...
First thanks to everyone who helped me in developing this plugin (see acknowlegments in the webpage).
Now, and this is making me crazy: I swear the code worked fine under FF2 a week ago, but now I'm getting an exception each time I try to apply a style (any kind of style). These is the exceprt of code that triggers the exception:
<br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">doRichEditCommand: function(aName, aArg){</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
  try {</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace; font-weight: bold;">    private.document.execCommand(aName, false, aArg);</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">   } catch (er){</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">    if (window.console) console.log(er)</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">    else alert(er);</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">  }</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">    private.iFrame.contentWindow.focus();</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">}
</span>
So basically now it works pretty well in IE6, but not in Firefox and I don't understand why. I even tried disabling some of my plugins in case they where messing it up or something, but nothing, so I would be really thankful if someone could take a look at it and test it themselves.
Thanks everyone.
Abel.
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