How do I - Sprite comes onto screen pauses then leaves again

Hi all,

How would I have a sprite (enemy ship in a horizontal scrolling shooter) come onto the scene smoothly from the right, pause in the middle of the screen for a few seconds, and then pick up speed and fly off the left hand side of the scene.

I'm a newbie and can't quite get my head around how to achieve this.

Any help much appreciated!

Thanks

Compare it's X coordinate. Wait and then make it move to the other way?

Thanks alvarop. First bit sounds simple enough. How do I go about waiting before moving off again?

There is a command called wait, heh!

So there is I've had to accomplish this with 2 conditions and 6 actions! Gotta be a more efficient way than this...

(events)

enemy X < 500

enemy StoppedYet = 0 (instance variable)

(actions)

Set StoppedYet to 1

Set Bullet Speed to 0

Set Bullet acceleration to 0

wait 3 seconds

Set Bullet Speed to 400

Set Bullet acceleration to 400

Is that the best way?