Is there any tutorial for making a switch, that small sized button?

Creating a Switch

And see the Discussion page for an alternate way of creating the switch, that will allow you to be able to press the button again mid-cycle to reset the timer.

thanks. by the way. how do i get the model stay pushed down? there seems to be no idle animation for that

You just give it an input of SetAnimation "down". This will cause it to stay down until you set the animation to up or idle.

Thank you very much.

Oh, does that have something to do with the default animation?

Yeah. The idle animation will keep it at the last frame of the SetAnimation.