OMG I just found your post today.
This is my third try to answer you... I keep getting reset and losing what I type!
I wrote 2 long long messages. This time brief and post.
Use an IFRAME. It is a window cut into your newsletter, allowing content from other pages to be seen.
Iframe code: Put this into your newsletter page.
<iframe name="NLVideo" src="nl_vid0.htm" width="350" height="280" frameborder="0" scrolling="no" ></iframe>
Build plain web pages with no menus, borders, etc. (But DO put a tiny link to your home page at the very bottom)
nl_vid0.htm this page has "click links to see videos"
nl_vid1.htm this page has the first video embedded
nl_vid2.htm this page has the second video embedded
nl_vid3.htm this page has the third video embedded
Then make your links. When someone clicks the link, the target iframe changes content. Target defines WHERE the link opens, in iframe, new window, same window...
<A href="page1.htm" target="NLVideo" title="Describe the first video">Link 1</A>
<A href="page2.htm" target="NLVideo" title="Describe the second video!">Link 2</A>
<A href="page3.htm" target="NLVideo" title="And yet a third video you want to see">Link 3</A>
<A href="page4.htm" target="NLVideo" title="And of course the 4th video">Link 4</A>