IsValidSelectionPoint(nsSelection *aFrameSel, nsIDOMNode *aDomNode)
IsValidSelectionPoint(nsSelection *aFrameSel, nsIContent *aContent)
IsValidSelectionPoint(nsSelection *aFrameSel, nsIDOMNode *aDomNode){    nsCOMPtr<nsIContent> passedContent;    passedContent = do_QueryInterface(aDomNode);    if (!passedContent)      return PR_FALSE;    return IsValidSelectionPoint(aFrameSel,passedContent);}