Event listeners problem

I have a problem with the firing of event listeners. I have 4 functions (see below). Function f1 is triggered when button1 is clicked and function f3 is triggered when button3 is clicked. Then f1 calls getFileOperation (a webservice operation) and should call function f2 whereas function f3 should call function f4.
function f1 (event:MouseEvent):void
trace("f1 triggered");
getFileOperation.addEventListener(ResultEvent.RESULT, f2);
function f2 (ev:ResultEvent):void {
trace("f2 triggered");
function f3 (event:MouseEvent):void
trace("f3 triggered");
getFileOperation.addEventListener(ResultEvent.RESULT, f4);
function f4(e:ResultEvent):void {
trace("f4 triggered");
However the output being given when I press button1 followed by button2 is:
f1 triggered
f2 triggered
f3 triggered
f2 triggered ///repeated!!!
f4 triggered
Similarly the output being given when I press button2 followed by button1 is:
f3 triggered
f4 triggered
f1 triggered
f4 triggered ///repeated!!!
f2 triggered
Why is f2 fired again in the first case and f4 in the second case? How can I go about it to avoid this repetition. Any help would be appreciated...thanks!!

I tried to change getFileOperation to getFileOperation2 in one of the functions as follows but same problem appeared.
function f3 (event:MouseEvent):void
trace("f3 triggered");
getFileOperation2.addEventListener(ResultEvent.RESULT, f4);
Do you have an idea how I can avoid the same function from triggering twice?? thanks a lot

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I tried to change getFileOperation to getFileOperation2 in one of the functions as follows but same problem appeared.
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Do you have an idea how I can avoid the same function from triggering twice?? thanks a lot

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Click
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