Loading a Flash movie via an external link?

OK, so I’m making a pretty simple website, and it will have a a few different picture galleries. What I’d like to do is build the shell with HTML and CSS (pretty basic site); background graphics, main menu and so on, then have the Flash galleries load into an empty movie clip when you click the hyperlinks in the main menu. I really don’t want to make a giant flash film. Now, I know I can do it with an iframe, but I’d rather avoid it. Hopefully the question makes sense, I’m not a pro (obviously)

Thanks in advance!