You're not going to be able to use an excludeblock and get the results you want.
You have it set up to edit the full page - with the exception of the excludeblock. The problem is that the menu javascript creates a new element on the page for each menu item expansion. These new elements are inserted into the body of the page with document.body.appendChild. Therefore, when you save the page these elements become permanetly part of the page.
You need to instead use an editblock in the part of the page that you weant to be editable - I assume the area containing "The form has been sent."
<span class="arial100FFFFFFtb" editblock="one">The form had been sent<A class="arial100FFFFFFtb" onclick="javascript:history.back();return false;" href="/a.htm#">!</A></span><!-- editblock="one" --></div>
If you place an editblock on the page, EditWrx is entirely unaware that there is anything else on the page. Therefore, elements that get added to the body outside of the editblock is completely ignored.
Also, editability can have rendering problems on absolute elements because of inheritance problems. Notice that your menu expansions are distorted the way you have it with the full page being editable. If you instead us an editblock so that the menu expansions are outside of the editable area, the menu expansions display correctly.
