How can I make different threads use different values?

[Sheetal Jharia Baru]

I am using OS Sampler to execute a shell script on my local ubuntu system.
This script in turn downloads a image from remote repository. As expected ,
when the script is run multiple times, same image is downloaded. Is there a
way that each thread can download a different image (can image become some
sort of variable and I can give different image name via this variable to
each thread ?
Any help is appreciated.
Thanks !