Remove Loader

Question

Hi -
I am so grateful for this Forum - thank you in advance for all your great input!
I am loading .swf files in with this code (via buttons):
var phoLoader:Loader=new Loader();
photos_btn.addEventListener(MouseEvent.CLICK, photos);
function photos(myevent:MouseEvent):void {
var myURL:URLRequest=new URLRequest("lore_photos.swf");
phoLoader.load(myURL);
phoLoader.x = 0
phoLoader.y = 0
addChild(phoLoader);
var mmLoader:Loader=new Loader();
mm_btn.addEventListener(MouseEvent.CLICK, mimo);
function mimo(myevent:MouseEvent):void {
var myURL:URLRequest=new URLRequest("mm.swf");
mmLoader.load(myURL);
mmLoader.x = 0
mmLoader.y = 0
addChild(mmLoader);
staff_btn.addEventListener(MouseEvent.CLICK, unloadcontent);
function unloadcontent(myevent:MouseEvent):void {
removeChild(mmLoader);
var staffLoader:Loader=new Loader();
staff_btn.addEventListener(MouseEvent.CLICK, staf);
function staf(myevent:MouseEvent):void {
var myURL:URLRequest=new URLRequest("staff.swf");
staffLoader.load(myURL);
staffLoader.x = 0
staffLoader.y = 0
addChild(staffLoader);
mm_btn.addEventListener(MouseEvent.CLICK, unloadstaff);
function unloadstaff(myevent:MouseEvent):void {
removeChild(staffLoader);
When I test the main .fla (which contains the code), I get this error message - even though everything is working fine - what does it mean? What's a "caller"? 
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/removeChild()
at davon_fla::MainTimeline/unloadstaff()

Answer 1

Hey - tried various options but still getting error messages.  Maybe it's because it's a .swf file within a .swf file, because clicking on the buttons in the About section of the site doesn't wipe the slate clean like when I click on the main navigation buttons of the site.
If you go to the site:   www.loreleynyc.com/loreleynyc.com_neu   and click on About and then on Staff and then on Michael Momm you will see that they overlap.  I guess because it's a movie within a movie it doesn't automatically clean the slate like it does with the "main navigation" buttons and pages of the site.  I'll try a different way now, on the timeline, because i gotta get this site up, but it must be possible with Actionscript, no?
Also, see the html at the bottom, how can I make the margin to the .swf file bigger?
Thanks a million!
I have attached the .fla files aswell, saved in CS3