Changeing scenes

I need to know how to change scenes using triggers or other things if you can scripts would be nice thx

http://unity3d.com/support/documentation/ScriptReference/Application.LoadLevel.html

You could attach scriptA to sceneA's MainCamera and scriptB to sceneB's MainCamera (and actually any other game object in teh scene) but do this only once. You can programmatically change scenes like this:

//Attach script to SceneA
public class SceneAScript : MonoBehaviour {

    private void OnGUI() {

        if (Input.GetKeyDown(KeyCode.LeftControl)) Application.LoadLevel("SceneA");

        if (Input.GetKeyDown(KeyCode.RightControl)) Application.LoadLevel("SceneB");

    }

}

//Attach script to SceneB
public class SceneBScript : MonoBehaviour {

    private void OnGUI() {

        if (Input.GetKeyDown(KeyCode.LeftControl)) Application.LoadLevel("SceneA");

        if (Input.GetKeyDown(KeyCode.RightControl)) Application.LoadLevel("SceneB");

    }

}