You can remove the original pages, but I would not recommend it since they are nice to have around in case something happens to not be working in my pages.
Perhaps all you need to do is go into each user account properties (especially the Anonymous account if you are using it!) and set the homepage to
ui2.htm so that way if someone is entering your address they would be directed to ui2 by default. This would not affect anyone's bookmarks though.
If you want to completely replace the original pages, there are a few ways to do this.
1. Replace the original pages with ui2.htm. In other words, delete the originals and make copies of ui2.htm, renaming the copies to default.htm, jpegpull.htm, jpegpush.htm.
or
2. Open each page and insert logic to redirect to ui2.htm. Just put this among the other
meta tags near the top.
HTML:
<meta http-equiv="REFRESH" content="0;url=ui2.htm">