I'm trying to change the imagesize on the slideshow of this theme, i don't known how change the standard 480 pixel width (i want put 900 pixel), which files i must modify? tnx!

There is an option on the backend plugin options.

do you intend: options > options themes>image size? if yes, i can say that i tried to change the size, but nothing happens in the gallery!

Ah, that theme is a little complicated and specific, you will have to change that on image.php of that theme. There are some places where you will find a "480". Try to change that but be aware that you might need to change some css also so that it really looks right.

If i set protect mode of images,then I always get one same image of full size and can't save it into my hard disk,why?
(I'm poor in English I am sorry)