Watch Satellite TV On Your PC

I have my laptop hooked up to my tv with a HDMI cable. I can get the display on both at the same time. But I can only get sound to come out of my laptop when I unplug the cable. Is there a way to get sound of both the tv and laptop at the same time?
when the hdmi cable is plugged in i can get the sound to come from the tv, but it cuts off the sound from the laptop

How to connect a lap top or desk top to your TV, whats needed and also watch the video:
http://www.online-tech-tips.com/computer-tips/how-to-connect-your-laptoppccomputer-to-your-tv/