How can I stop this timer...?

Hi,

In my game, I have 2 buttons called "Forward" and "Down".

When I press the `Down`, my `Downward facing` image shows and starts to fall :

Image.Pic = ImageFall.Pic
Image.Top = Image.Top + 30

But, when I then want to "Level off" and select my "Forward image" button :

Image.Pic = ImageForward.Pic
Image.Left = Image.Left + 5

... The forward facing image continues to fall, as in the first example.

Is there anyway I can disconnect the timer for the "ImageFall", or is there a way to resolve this.

Thanks

Mark