The logo is an a table, the table has a background of probably a 1x30 pixel image, and essentially it is just stretched 100%.. if that makes any sense to you. So, you don't have to make like, If then statements and make images of all different sizes. Just to let you know, because it is a hard concept to grasp actually, but, once you get it, it is quite powerful, and looks very nice.
They all follow the same rules, some are more strict than others, however you shouldn't run into any problems. And yes, that actually is a downside, but with a little image tweaking.. or a lot heh, you can actually make it look quite flawless. It does take time