How to change the picture in this example

Hi
Can someone guide me how I can change the picture is this example

http://www.flashvalley.com/fv_tutorials ... _getPixel/

I want to test it with my own images.

you see this code ?
linkageId = "landscape";

open up your library and search for the image right click it and click linkage .
you will see export for actionscript is ticked ...
untick it ...

now import your image to the library , right click it [ within your library ] click on linkage , in the identifier field type in : landscape

run and test it , should work .