change music in flash player

On the bottom of [login to view URL], we've got a flash player that plays a couple sound loops for music. We need the music on the site to be switched out with a couple mp3's. The site runs from the main flash file, and the player is a flash file of its own. We tried to switch the music ourselves, but the mp3's won't play all the way through. It only plays about 30 seconds or so and then stops. We just need someone to show us how to switch them out so they play all the way through. We need this done by the end of this week. The sound file is too large to attach, so please request it if you need to see it before bidding.