Arrays with movieclips

I have a bunch of mc’s that I’d like to fade out when a button is rolled-over. I’d then like the mc’s to return to alpha = 100 when the button is rolled-out. instead of listing all of the mc’s, I thought I’d create an array with all of the mc’s instance names and then reference the array in my ._alpha function. Problem is, when I trace my array, it’s not tracing which obviously means I haven’t coded the AS properly.

I’ve searched for help with arrays but it seems most array tutorials just focus on strings and not mc’s (my array works when I add quotation marks but then it’s referencing strings and not objects). Can someone show me the proper code to make this work??