AS Movieclip Fade Out

I’m new to the forums and to actionscript.
I’ve been trying to get a simple fade out of a logo to work.
I converted the logo to a movieclip called logo_mc
I click on the logo_mc movieclip and insert this actionscript.

onClipEvent (load) {
if (this._alpha>0) {
this._alpha -= 5;
}
}

I have also tried putting the code on the main timeline without any success.

If I understand correctly this should see if the alpha is greater than 0 and if it is it should decrease the value by five increments until it reaches 0.

Thanks for any help