mDirty = PR_TRUE;
nsCOMPtr<nsIDOMHTMLElement> domElement(do_QueryInterface(aContent)); return Add(domElement, nsnull);
nsHTMLOptionCollection::AddOption(nsIContent* aOption){  // Just mark ourselves as dirty. The next time someone  // makes a call that requires us to look at the elements  // list, we'll recompute it.  mDirty = PR_TRUE;}