How to link button(s) on your main .fla to another individual fla.

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I am quite new to flash and this is the first time I'm actually creating a somewhat complex website. However, I am having trouble connecting all the things I have made for it. The website starts off with a preloader, then the main menu opens, parts of the website are moved into place, text is moved into place as well, and the site is ready to navigate. My problem, however, is the following; I have a navigation menu on the left side with 4 buttons: home, photos, about, contact. I have another .fla where the photos are well placed and animated. So i was curious as to know how I would, for example, link the button "photos" on my main flash, to my .fla with the actual images. Thanks