Preloader and external swf question (this time i reallly searched :) )

I want to load an external swf and I keep seeing
[AS]
container.loadMovie(“trans.swf”)
[/AS]

I want to make it so the main movie loads and the external loads afterward (or during) so the load time on the main movie decreases. I entered the above AS in the first frame of my main movie but it doesn’t seem to be working. Do I need to add something like on(enterframe) or something? Also, does it matter if i put a preloader on a movie clip (that doesn’t load an external swf)? Will it help the load time at all or will everything load at once, thus defeating the purpose of having a preloader?

For the container movieclip i just drew a black square… Does the container movieclip have to be the exact size of the external swf? Can someone just tell me how to load a file external, and I mean please just dont tell me the AS, i mean can u tell me exactly how to do it? THANK YOU VERY MUCH.

Mike