For the html menus, try clicking on the following line of code:
<script type="text/javascript">if(window.attachEvent) { window.attachEvent("onload", function() { cssmw3.intializeMenu('cssmw3',{select_current: 0, orientation: 1}); }); } else if(window.addEventListener) { window.addEventListener("load", function() { cssmw3.intializeMenu('cssmw3',{select_current: 0, orientation: 1}); }, true); }</script>
and see if you are able to edit the menu. If that is the case then in your Dreamweaver Preference panel, click on Invisible Elements and make sure you have the scripts check box checked.