Ease on Button Press

programming flash
1

I have a movie clip (panel2_mc) that I want to move up and down on the press of a button (dropbtn). I have tried applying this code:

onClipEvent(load){						
_x=98;
_y=289;
speed=3;
}

dropbtn.on (press) {targety=90;}		
dropbtn.on (release) {targety=289;}

onClipEvent(enterFrame){
_y+=(targety-_y)/speed;
}

to the panel2_mc movie clip, and have also tried applying this:

panel2_mc.onClipEvent(load){						
_x=98;
_y=289;
speed=3;
}

dropbtn.on (press) {targety=90;}		
dropbtn.on (release) {targety=289;}

panel2_mc.onClipEvent(enterFrame){
_y+=(targety-_y)/speed;
}

to the entire frame. Please tell me where I am going wrong?