Add a code block to your page with the following HTML.
<select id="archive-pages" onchange="window.open ( this.value, '_self' );">
<option value="#">
Choose your page
</option>
<option value="/page1.html">
Page 1
</option>
<option value="/page2.html">
Page 2
</option>
<option value="/page3.html">
Page 3
</option>
</select>
You will of course have to change the page name values and urls.
Let us know how it goes.