Sound overlapping problem in flash

Hello. I’m a beginner with this whole As3 lango and running into a couple of road blocks. if someone can give me a hand It will be greatly appreciated. I designed a flash site with a total of four pages. I have background music playing when at the homepage and continues to play when browsing the other three pages, but when I navigate back to the homepage the background music replays and overlaps itself. Is there a way I can stop the background from repeating itself every time I navigate back to the home page? :-/