Adding an array value to an instance name

This should be an easy one cos I think I’m close already.

Basically, I want to loop through an array and call the same method for each button instance. So instead of hardcoding this:

sections_mc.section**2**.alphaTo(10,.5,"easeoutquad");
sections_mc.section**3**.alphaTo(10,.5,"easeoutquad");
sections_mc.section**4**.alphaTo(10,.5,"easeoutquad");
sections_mc.section**5**.alphaTo(10,.5,"easeoutquad");
sections_mc.section**6**.alphaTo(10,.5,"easeoutquad");

I can use something like this:

for (i=0; i < sectionArray.length; i++) {
    sections_mc.section + **sectionArray*** + .alphaTo(10,.5,"easeoutquad");
}

I tried various things like concatenating the command and using eval:

eval("sections_mc.section" + sectionArray* + '.alphaTo(10,.5,"easeoutquad");';

However, none of my efforts worked.

Please could somebody help me?