Amex launches trading options today on the Nasdaq for Discovery [DISCA]. The options will open with strike prices of 12-1/2 – 15 – 17-1/2 and position limits of 2.5mln shares. — Liberty Global initiated an offering of $365mln sr notes due ’14. Gross proceeds will be used for general corporate purposes. — Viacom declared a regular quarterly cash dividend of 7 cents/share on its Class A and Class B Common Stock, payable Oct 1.