Infinite Draggable Menu

I'm using the code below for an infinite looping menu but this menu code makes it move on its own. I want the looping/movement to be activated by the user literally dragging up and down. Does anyone know how I can alter this code so it responds to the user dragging up and down. Any help would be appreciated. Thanks.

import flash.events.Event;
var ycenter:Number=300;
var speed:Number=.05;
slider_mc2.addEventListener(Event.ENTER_FRAME, doit);

function doit(event:Event):void
{
var distance:Number=mouseY-ycenter;
event.target.y+=(distance*speed);//or clip.y+=(distance*speed);
if (event.target.y > 110) {
event.target.y = -1074;
}
if (event.target.y < -1074) {
event.target.y = 110;
}
}