Using XHTML on an ASP page?

XHTML Transitional , ASP (not .net) pages

Couple of quick questions:

1. I assume that one can use xhtml in an .asp page?
2. The particular page I am trying to convert has the following code that the w3c html validator doesn’t like and would appreciate your suggestions:

<%@ Language=JavaScript %> and similarly …

The <% and %> are causing the w3c validator to spew out multiple errors such as “document instance must start with document element” and “character “<" is the first character of a delimiter but occurred as data" Thanks in advance for your help!