how to make an object move on the menu screen?

Hey
I want to add some animations in the menu screen of my game. I want an object to keep on floating on the menu screen. To be specific, I want bubbles to keep on moving from bottom to top on my menu screen. It just moves (No interaction with the users). How can I implement this?

Thanks… [import]uid: 159148 topic_id: 37473 reply_id: 67473[/import]