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Uncaught exception: TypeError: Cannot convert 'document.post.message.caretPos' to object

Error thrown at line 430, column 2 in isSelection() in www.delphi-forum.de/scripts/posting.js:
    return document.post.message.caretPos.text.length > 0;
called from line 484, column 1 in bbstyle(bbid) in www.delphi-forum.de/scripts/posting.js:
    isSel = isSelection();
called from line 1, column 0 in <anonymous function>(event):
    bbstyle('b')

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function isSelection() {
	document.post.message.focus();
	if (is_ie4up)
		return  document.selection.createRange().text != '';
	else if (is_gecko)
		return document.post.message.selectionStart != document.post.message.selectionEnd;
	else if (is_opera)
		return document.post.message.caretPos.text.length > 0;
	else return false
}

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function isSelection() {
	document.post.message.focus();
	if (document.post.message.selectionStart)
		return document.post.message.selectionStart != document.post.message.selectionEnd;
	else if (ocument.post.message.caretPos)
		return document.post.message.caretPos.text.length > 0;
	else if (document.selection.createRange)
		return  document.selection.createRange().text != '';
	return false;
}

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window.opera.defineMagicFunction('isMicrosoft',
  function (oRealFunc, oThis, oParam1)
  {
    return true;
  }
);