How can I get my dog to stop barking?

[aly]

Whenever we let our dogs outside all one of them does is barks. He always goes to the side of the house and looks at the gate to bark at people and stuff going past the house. And he'll bark at other dogs barking. He'll bark sometimes at nothing. Sometimes he'll even bark so much that the other dog will start barking. And when we try and get them back inside the one barking all the time won't come. And we don't want to go outside because it's the middle of winter. We've gotten complaints, and I really don't know what to do.

Any suggestions?