Implementing enable and sleep on an EasyDriver

I have an older version of the EasyDriver stepper controller that doesn't have sleep and enable exposed like the latest version. The new version was released a couple of weeks after I bought mine :( I'm using the Arduino to control a macro panorama head: I need to be able to safely cut the power to the stepper motor as the vibration when it's not stepping affects the images. Is there a simple way to do this?