How can I change power button action to not going sleeping but to show dialog like in older Mac OS versions?

When I press power button in my Mac Book Air with Maveriks OS i have my computer going sleeping immediately. Often I press that button because I do not hit the backspace button (delete button), which right below power button. And I am getting my computer sleeping in the middle of typing my coude or chating. 😐

How can I enable old action that and make my mac ask me what do I want to chose?