I'll add one more comment...I tend to find that when saving graphic layout elements for web use, that a jpg compression of 60% normally works well - sometimes depending on the image, I might need to lessen the compression to 70-80%, but that doesn't happen often & is really only the case where the are subtle gradients/tone changes.
There are also cases where you can get away with more - I recently had some that I pushed to 45% compression & I was still happy with the image quality for the purpose of those images....its something that you need to judge on an image by image basis.