Alpha fade using actionspirt

I am using this code:

on (release) {
unloadMovie(“content”);
}
}
on (release) {
loadMovie(“linkbank/linkpool/art.swf”, “content”);
}

However, when it unloads its not smooth, its sudden. How do you made the current object loaded in “content” fade alpha and then once it reach 0 load the next clip? Keeping in mind that i want it all in a scirpt form that i can easy add to a button.

thanks! love ya