Newbie - image always ontop

[Mosaka]

Hi
i am new here.
I dont know much about programming (just basic stuff).
I would like to make an excecutable which simply displays a tiny graphic in the center of the screen, and should always be shown ontop of everything.
I think its easy.. But no idea how to apoach it
A developed idea would be that it identifies an name of a file eg "image" and uses that, so i would be able to change the image without reprograming )
Any ideas/sample script would be veeeeeerryyyyyy much apretiated.

thanks so much in advanced!!!