suppose i'm going to have a data structure like this: [ [imgFullPath,(width, height)], [imgFullPath,(width, height)], [imgFullPath,(width, height)], [imgFullPath,(width, height)], ... ] should i use (width,height) or [width,height]? what advantage i get to use n-tuple instead of the generic list? Thanks. Xah xah at xahlee.org ∑ http://xahlee.org/