New here...hello!!!

My name is Marvin and im new here and new to pools as well. I need you guys to help me identify what the outlets that are on the side of the pool by the skimmer do. What purpose do they hold. They have tabs to open them up but theres no water coming out nor going in....thanks for you help.

heres a picture of the inles and pictures of the pump and stuff.
http://i99.photobucket.com/albums/l3...pskot86lwl.jpg
picture of the pump.
http://i99.photobucket.com/albums/l3...psbf3rr584.jpg
pump
http://i99.photobucket.com/albums/l3...psohcof98m.jpg