Having trouble, please help...

I've got the following XSL template. I want to pass it four parameters. One
for the ParentNode it should select, one for the CurrentNode to select, and
two other text based values.

I use the following code to implement the template:

	  <xsl:call-template name="PrintRows">
	    <xsl:with-param
name="ParentNode">RetrieveNameAndAddressRSResponse</xsl:with-param>
	    <xsl:with-param name="CurrentNode">NameAddress1</xsl:with-param>
	    <xsl:with-param name="RowColor">#FFEBBF</xsl:with-param>
	    <xsl:with-param name="DisplayText">Holder Name:</xsl:with-param>
	  </xsl:call-template>

and the template looks like this:

<xsl:template name="PrintRows">
	<xsl:param name="ParentNode" />
	<xsl:param name="CurrentNode" />
	<xsl:param name="RowColor" />
	<xsl:param name="DisplayText" />
	  <tr>
	    <td bgcolor="{$RowColor}" valign="top" width="45%">
		<b><font face="Arial, Helvetica, sans-serif" size="2">
			<xsl:value-of select="$DisplayText" />
		</font></b>
	    </td>
		    <td bgcolor="{$RowColor}" width="45%"><font face="Arial, Helvetica,
sans-serif" size="2">
		<xsl:apply-templates
select="RetrieveNameAndAddressRSResponse/NameAddress1">
		</xsl:apply-templates>
		    </font></td>
	    <td bgcolor="#000066" width="5%"><br/></td>
	    <td bgcolor="#FF9933" width="5%"><br/></td>
	  </tr>
</xsl:template>

Now in the above example, everything is fine, but I need to replace the
apply-templates line with something using the two parameters passed.
Whenever I do

	<xsl:apply-templates select="$ParentNode">

I get a "Reference to variable or parameter 'ParentNode' must evaluate to a
node list", but when I use

	<xsl:apply-templates select="RetrieveNameAndAddressRSResponse">

It works fine. So my question is:

How can I get
<xsl:apply-templates select="RetrieveNameAndAddressRSResponse/NameAddress1">
when using
<xsl:apply-templates select="$ParentNode/$CurrentNode">


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