Sorry, Nik, I have to agree with what marto said. Maybe it's the language barrier (English vs. Greek) that keeps getting in your way, or it's some sort of learning disability that you have. Maybe you are simply not cut out to be a programmer. But I find it really strange that your script contains this line:

while (@files) {
[download]

What are you thinking when you write stuff like this? Are you thinking? Try thinking: "what would that sort of while loop actually do?"

Good luck.