Sound in Background

Hi everyone!!

All i want to know is simple, but might be complicated i dont know!

How do i get a sound to play throughout the entire flash site in the background?

Go to www.cruciallimit.com and you will see what i mean.
Its a great site by the way!

In this “crucial limit” site, he has tunes playing in the background, and they keep playing despite how deep you navigate throught the site, no matter what button you press, the song continues to play without stopping.
Thats what i want to achieve.

Can anyone help me???

=)