Problem with .exe file in debug folder?

The program i checked was a simple program just containing one .jpeg image in the resource file displaying on the window background using stylesheet .
While i am clicking .exe file of my project in my system in which Qtsdk is installed i am getting proper output but while i am coping the debug folder in another system and repeating the same procedure i am not getting the image associated with the project in the output.
What may be the cause of that?

you have to copy the image plugins dlls too.

ya i am searching for that only.