[FLASH8] Placing a startFlag in the Easing code


I am relatively new to ActionScript using Flash Professional 8 and was wondering if I can implement the startFlag as used in the Sliding Menu tut into the Easing code found a this tut http://www.kirupa.com/developer/flash8/easing.htm

So that the object must reach it’s destination before you can click the button to send it off again.

Any help would be great.