How can i make this code loop forever???

import flash.display.*;
import flash.events.*;

var directionInt:Number = 1;

addEventListener(Event.ENTER_FRAME, function(){
if(((test.y+test.height) < stage.stageHeight) && (test.y > 0)){
test.y = test.y+directionInt;
}
else if((test.y+test.height) >= stage.stageHeight){
directionInt = -1;
test.y = test.y + directionInt;
}
else if(test.y <= 0){
directionInt = 1;
test.y = test.y + directionInt;
}
})