How to work with XML in javascript

I need your advices and explanation to understand the principles of working with XML.

I have this answer from server;

<?xml version="1.0" encoding="windows-1251"?>
<div style="" class="submenu" id="menu_item_ZdQZyvGsAL" data-type="submenu-item">
<span class="adm-submenu-item-arrow" style="width:72px;" onclick="showSubmenu()">
</span>
</div>
<div style="" class="submenu" id="menu_item_fGvdfvGsAL" data-type="submenu-item">
<span class="adm-submenu-item-arrow" style="width:72px;" onclick="showSubmenu()">
</span>
</div>

how i can put all this block of code into new

<div id="final_id"></div>

i can not work with responseText, want to use responseXML. Also i have permissioin to server and can add some special tag for generated XML for example

 <?xml version="1.0" encoding="windows-1251"?>
 <wrapper>
 <div style="" class="submenu" id="menu_item_ZdQZyvGsAL" data-type="submenu-item">
 <span class="adm-submenu-item-arrow" style="width:72px;" onclick="showSubmenu()">
 </span>
 </div>
 <div style="" class="submenu" id="menu_item_fGvdfvGsAL" data-type="submenu-item">
 <span class="adm-submenu-item-arrow" style="width:72px;" onclick="showSubmenu()">
 </span>
 </div>
 </wrapper>

so i need all information between tags

 <wrapper></wrapper> 

to enter in

 <div id="final_id"></div>