Overlaping the images.

Hi, GS dudes.
What I am running into trouble is overlaping (duplicating) images. I made a image that come up from the bottom and stop the center of the screen.
However, the image is overlaped. There is a same image on the image.
I used "interpolate" behavior to scroll up the image.
Please help. Thanks
What I am running into trouble is overlaping (duplicating) images. I made a image that come up from the bottom and stop the center of the screen.
However, the image is overlaped. There is a same image on the image.
I used "interpolate" behavior to scroll up the image.
Please help. Thanks

Answers
/Users/jin/Desktop/screenshot 2012-04-09 am 1.02.52.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.03.00.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.03.03.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.03.07.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.03.11.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.03.15.png
/Users/jin/Desktop/screenshot 2012-04-09 am 1.10.35.png