There may be a quality setting for .jpeg images that you can adjust.
Can I get ftp access to look at your page and see if that might be the problem?
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.