While you're in the stock pic gallery, you will see an arrow play icon with a rectangular box. When you select that to play if there is a dlna device near it should ask you if you want to play on it.
Never mind... I got it to work after following some directions I found on the web. Boy the flaws in photos really show up on a tv screen. Videos looked better than pictures.
Im using Android Ginger bread. I have DLNA as an inbuild app. But i dono how to use it. Is it mandatory that the laptop which we are sharing the pics or video should have DLNA ?? or WIFI is enough ?? If so.. How to configure DLNA in Laptop or PC ?