steady camera reset?

i'm making a racing game and i'm using the first script init the camera standard asset package. it rotates the camera around the object according to mouse movements. it then stays in that position. i would like it to return slowly to its starting position. how can i modify the code to achieve that? i don't mind if you answer in js or c#, i know both.

also, the camera's height begins at 0. i would like it to begin at 10. thanks in advance :D