Una soluzione l'ho trovata, ma adesso la validazione restituisce 3 errori per XHTML 1.0 Transitional e 2 errori per il CSS.
Non so dove sbattere la testa. 
codice:
<head>
<title>CSS DINAMICO</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<link type="text/css" rel="stylesheet" media="screen" href="/css/latestprojectspic.asp?strCss=<%=strCss%>&strCartella=<%=strCartella%>" />
</head>
latestprojectspic.asp
codice:
<% Response.ContentType = "text/css" %>
.latestprojectspic {
background-image: url(/images/<%=request.querystring("strCartella")%>/<%=request.querystring("strCss")%>);
background-repeat: no-repeat;
margin: 0px;
float: left;
height: 133px;
width: 236px;
padding-top: 25px;
padding-right: 0px;
padding-bottom: 0px;
padding-left: 165px;
}
Validazione CSS:
Validazione XHTML 1.0:
codice:
Validation Output: 3 Errors
Line 252, Column 6: document type does not allow element "head" here
<head>
✉
The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).
One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).
Line 387, Column 6: document type does not allow element "head" here
<head>
✉
The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).
One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).
Line 410, Column 6: document type does not allow element "head" here
<head>
✉
The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).
One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).
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