importing swf file within a mc button

Generally, if you have a button within a button, the outer button will not allow the inner button to work.

Also what do you mean regarding "open a external swf"?

when using AS2 you cannot 'read' events that occur on a child clip of a parent that has an event handler (ie. onPress, onRelease, etc.)

in this case you need to use a method such as hitTesting within a loop the child clip once the exterior event handler has been invoked, such as with a drop down menu.

there are several posts here with code solutions to this problem, i know that i and others have posted. search the forums for this issue and you will find the solution codes needed.