One button, multiple functions

Hello.
I have used the loader script to load an external swf into current project. I have added a button to unload the external file when wanted, and was wondering if you could have multiple functions for that button, so that when you click it to unload it works as a 'home' button as well, and takes the user back to the mainpage again?
AS3 btw.
Might be wise to mention that im kinda new to adobe flash and as3, and not sure if the way i have used to load the external swf was the easiest. Seems like a few have had some issues with this subject before me as well.
All pointers in the right direction is appreciated. Cheers.

Thanks alot for answer Ned Murphy.
As I've might failed to mention, is that the button is intended to do two things, unload and return to main page, at the same time. So basically a one click operation.
To update the situation, I've tried this as a code;
btnHeim.addEventListener(MouseEvent.CLICK,unloadSwf);
function unloadSwf(e:MouseEvent):void {
    loader.unload();
btnHeim.addEventListener(MouseEvent.CLICK,tilbaks);
function tilbaks(event:MouseEvent):void{
    gotoAndStop(1,"Mainpage");
It kind of work, as it unloads and takes you back to the main page. Only thing then is that the buttons on mainpage doesnt work any longer, and one of them disappear?
I've never been this deep into AC3 i think, so not sure what the problem is, except for the fact that there is some issues going on.
This is the error that shows up on 'output' after btnHeim is clicked.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at Mappevurdering_web_fla::MainTimeline/frame2()
    at flash.display::MovieClip/gotoAndStop()
    at Mappevurdering_web_fla::MainTimeline/tilbaks()
Thanks again

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Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
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