What i would do is have a set of html comments, one for the start of the text area and one to end it. Then just have the vb code search for these strings (the html comments) and throw the text in between the comments. So your html file would llook somthing liek this:
<html>
<head>
<body>
<!--start of text-->
Your text goes here.
<!--end of text-->
some text that you don't want to ever change.
</body>
</html>