Grouping MC's together for AS command

Hi there!

I have four buttons, with instances of:
press_mc
design_mc
menemail_mc
general_mc

When I click my map_mc button - I want ALL four MC’s to have an alpha of 0.

But what I want to know is whether I can have a group name for these 4 MC’s.
For eg: menubuttons

thus:

map_mc.onRelease = function(){
menubuttons._alpha = 0;
}

How would I do this somehow???

This would be super handy.
I know that I could include them all inside one movie clip… But I dont want to go about it that way …

Thanks!