My Startup Items Mysteriously Changed

When I started my G4 this morning my StartUp items had changed. My iCal startup item had been replaced by a .jpg file (which launched the Viewer). The .jpg image was a web button with japanese (I think) writing on it.

Did some internet "spyware" or similar program do this? Is there any other way this could have happened??

Your ideas please.

If u want to see if there is spyware runing on your computer, fire up good 'ol process viewer, and look for something out of place. I too have had spyware infect my computer and run a window at startup with a URL in it or some such. get rid of it asap.