Loading and Unloading .SWF files

I have created a site using the most basic amount of AS possible because i am new to it and am just finding my feet, i thought i might be able to get away with using just button links and slideshows but now my site is getting very big and is taking a while to load, i have added a preloader to the beginning of the site in a different scene.

On my second frame i have a external .SWF file being loaded, it loads just fine but when i navigate away from the frame it is still there on every frame.

i would very much appreciate the help as this is very stressfull.

here is my code for the frame;
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*var SlideshowURL:URLRequest = new URLRequest(“Slideshow.swf”);
var SlideshowLoader:Loader = new Loader();
SlideshowLoader.load(SlideshowURL);
addChild(SlideshowLoader);
SlideshowLoader.x = 587.0;
SlideshowLoader.y = 268.7;

stop();*

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also if anybody knows a simple way i would like a progress indicator on this too but if its too much trouble then please help with my original question.
thanks