NS_NOTYETIMPLEMENTED("write me!"); return NS_ERROR_UNEXPECTED;
NS_NOTYETIMPLEMENTED("nsSVGTSpanElement::SelectSubString"); return NS_ERROR_NOT_IMPLEMENTED;
NS_IMETHODIMP nsSVGTSpanElement::SelectSubString(PRUint32 charnum, PRUint32 nchars){  NS_NOTYETIMPLEMENTED("write me!");  return NS_ERROR_UNEXPECTED;}