The usual approach is to develop on the lowest resolution, not the highest.
You might want to look into Isladog's db sample for resizing things.
Drop him a line there and tell him I said his examples and samples image links back to the same loading page, whereas the others seem to work. If it were not for that, I might have been able to find the sample db for this (at least I seem to recall there was one there).
http://www.mendipdatasystems.co.uk/
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.