How to target an .as file from another .as

Hello,

I was wondering If some one can help in teaching me how to target a function in one .as file from another .as file.

For example.

Lets say that in as1.as I have a function:


//---------as1.as
Function hello():Void {
  Trace(“hello”);
  }

And in as2.as I have function with in a button;


//---------as2.as
Button1.onRelease = function():Void {
  Hello();
  }

Hope it makes sense.

Thank you.