return (tag != 0 && tag.get() == nsSelection::sCellAtom);
return (tag == nsHTMLAtoms::td);
static PRBool IsCell(nsIContent *aContent){  nsCOMPtr<nsIAtom> tag;  aContent->GetTag(*getter_AddRefs(tag));  return (tag != 0 && tag.get() == nsSelection::sCellAtom);}