I am an Indian citizen with US Green card traveling to Vietnam through Hong Kong. Do I need HK Visa

My Husband (US citizen) and I (Indian citizen with Green Card) are Planning to Visit Cambodia and Vietnam through Honk Kong. Here is the summary of the itinerary:
1)WE arrive in Hong Kong On Dec 17th from US and leaving for onward journey to Cambodia on Dec 18th.
2) after 14 days arriving back to HK on 31st Dec from Vietnam and leaving HK for onward journey to US on Jan 1st 2012
So we will be be in Hk for 1 day each time we arrive HK (14 days gap between each entry)
Do I (Indian Citizen with US green Card) and My husband (US citizen) need Hong kong Visa.