How do tell a function what clip I am on?

Suppose I have three different movie clips. mc_A, mc_B, mc_C

I want to have a rollover call a function that changes each movie clip. But I don’t want to type it out like this:

mc_A.onRollOver = function() {
mc_B.onRollOver = function() {
mc_C.onRollOver = function() {

I want to do something more like this.

mc_A.onRollOver = setNewExplosion();
//repeat the above for B and C

function setNewExplosion() {

Above you will see that I used this, it made sense to me, but this always refers to the main timeline (root in my case). So how do I pass the name of hte clip I am rolling over to a function?

Thanks in advance,