XSL not posting form

[buji]

I have a page being build using raw XML data and XSL. In the XSL I have a form that is posting to "index.asp", with info for the selection that was chosen via a button. All this is working correctly: the grid displays with the correct information, and it does post to the index.asp page. However, when I try to Request.Form in the index.asp page after pushing one of the buttons, it comes back with nothing. I can request.querystring and it comes back with the correct info, but I do not want to use querystrings. Any thoughts on what I'm doing wrong?

index.asp page

<%@ LANGUAGE="VBSCRIPT" %>
<%
	Response.Write("QueryString = " & Request.Querystring)
	Response.Write "<br>"
	Response.Write("Form = " & Request.Form)

	Dim xmlDoc
	xmlFile = Server.MapPath("testsubnode.xml")
	xslFile = Server.MapPath("testhierarchy.xsl")
	Set xml = Server.CreateObject("Microsoft.XMLDOM")
	Set xsl = Server.CreateObject("Microsoft.XMLDOM")
	xml.async=false
	xml.Load(xmlFile)
	xsl.async=false
	xsl.load(xslFile)
	
	Response.Write(xml.transformNode(xsl))
%>

xsl file

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:template match="/">
		<html>
			<head>
				<script language="javascript">
					function drillDown(n)
					{
						var f = document.getElementById("f1");
						var s = document.getElementById("selectedAreaId");
						s.value=n;
						f.action="index.asp?nid="+n;
						f.submit();
					}
				</script>
			</head>
			<body>
				<h2>Select an Area</h2>
				<form id="f1" method="post" action="index.asp">
				<table border="0">
					<tr bgcolor="#9acd32">
						<th align="left">Area Id</th>
						<th align="left">Title</th>
						<th></th>
					</tr>
					<xsl:for-each select="Area/NodeData">
						<tr bgcolor="#55aaaa">
							<td><xsl:value-of select="AreaId"/></td>
							<td><xsl:value-of select="Title"/></td>
							<xsl:choose>
								<xsl:when test="ChildCount &gt; 0">
									<td><input id="btnDrill" type="button" value="Drill Down" onClick="drillDown({./NodeId});"/></td>
								</xsl:when>
								<xsl:otherwise>
									<td></td>
								</xsl:otherwise>
							</xsl:choose>
						</tr>
					</xsl:for-each>
				</table>
				<input type="hidden" id="selectedAreaId" value="0"/>
				</form>
			</body>
		</html>
	</xsl:template>
</xsl:stylesheet>