Help with collision detection!?

[nonameshere]

Can anyone tell me how to do a collision detection? I tryed the tutorial, but it's in Flash 4 and doesn't work when I tryed it myself.

I'm doing this: I have 2 circle graphics in a movie clip, then when there is a collision, I want the one movie clip w/ circle graphic to change its alpha to 0.

Thanks,

[FlashGuru]

add this script to each movieclip:

onClipEvent(enterframe){
distance = Math.sqrt((_x-_root.movieclip2._x)*(_x-_root.movieclip2._x)+(_y-_root.movieclip2._y)*(_y-_root.movieclip2._y));
if (distance<=_width/2+_root.movieclip2._width/2){
_alpha=0
}
}

now change the movieclip name that says movieclip2 to movieclip 1 when you assign the script to the second movielip!

Hope that helps!
Regards FlashGuru