virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName, nsIAtom* aPrefix, const nsAString& aValue, PRBool aNotify)
nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName, const nsAString& aValue, PRBool aNotify)
  virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,                           nsIAtom* aPrefix, const nsAString& aValue,                           PRBool aNotify)  {    return NS_OK;  }