Load into container & play another mc

i want to my mc to gotoAndPlay “out” in one movie clip …and then load another movie clip after that transition is finshed into the same container on the release of a button…

how can i do this…???

so far i have

on (release) {
con.loadMovie(“center2”);
}

and this is loading the mc (center2) into the container named con. but it’s not playing the “out” in mc (center1)…

i know it’s not in the code but i didnt know how to get it in there i’ve tried many ways but it does work…hopefully sumone can help…