How to call a method in a flash file (swf) from another fl;ash file (swf) and vica versa ?

Hi, I have a Flash file (Flash1.fla). I have a  public method, method1() in a public class of the file. I have another Flash file (Flash2.fla). I have a public method, method2()  in the public class of this file. I want to call the method1() from Flash2.swf and the method2() from Flash1.swf. Please help!!