perhaps try editing the body tag back to a basic tag to see if the edit option is triggered:
<body id="page5" onload="new ElementMaxHeight();">
to:
<body>
after editing the map you can change it back.
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.