Sound FADE

i posted about this a while ago but i wasnt very clear and so i didnt want to rehash that old thing so…

my problem is this…

i have music that i plann on using for my portfolio site and i want it so that when the user presses a button to go to another section of the site, the music doesnt abruptly turn off, i want it to smoothly turn down to zero…so for example if the sound is at 100% and when the user goes to another section, then the sound goes from 100 to 0 then loads the new section with its own sound etc…

i dont care if this actionscript is in a frame or on a button, as long as it works…i just want it to be smooth in general, i dont like it when in a site, i press the sound off button and the sound just abrubtly goes away.

any ideas anyone???

thanks