I just bought my first HD tv, it's a Haier 32 720p lcd. The picture quality is very good. One thing i notice is it has a backlight setting. The highest setting on it is 30. I lowered it to 5, since it was too bright. I notice everytime i raise it up, it messy up my contrast settings, it makes the 'whites' brighter again and then i got to lower the conrast. What is the proper way to adjust the backlight setting? Thanks in advance.