You don't need sophisticated software to create an online portfolio. It's actually a fairly simple job. All it has to do is present a selection of thumbnails for visitors to select and view larger images.
The difficulty is not in the programming of the portfolio, it's in making the interface smooth, elegant and easy to navigate. Flash has a powerful range of tools for doing this, and it's the application of choice for most professional designers. However, it's expensive, and if you're an artist rather than a web designer, it's a skill you'd probably rather not spend time learning.
