I'm a newb at photography, but I have an canon S70 and am trying to learn to use the manual functios because auto sometimes just doesn't cut it. One thing I have problems with is taking pictures of people at night when the background is 1. dark 2. bright (ie. downtown vegas with all the lights) I don't know how to use the flash to assist me to make the people bright while making the background show up. What happens when I take the picturei s 1. the people are way too bright 2. the people are very dark but the background is nice. Any tips?