one function call twice for the same variable

I need to call one function for the same variable twice (somethin like
recursive)...
How to do this?

<xsl:variable name="CustomerSignerLName">
          <xsl:call-template name="change">
			<xsl:with-param name="name_string" select="LNAME"/>
    		        <xsl:with-param name="delimiter" select="'-'"/>
	 </xsl:call-template>
</xsl:variable>

And once again with the same parameter:
          <xsl:call-template name="change">
			<xsl:with-param name="name_string" select="$CustomerSignerLName"/>
    		        <xsl:with-param name="delimiter" select="'-'"/>
	 </xsl:call-template>

And twice with another parameter:
          <xsl:call-template name="change">
			<xsl:with-param name="name_string" select="$CustomerSignerLName"/>
    		        <xsl:with-param name="delimiter" select="' '"/>
	 </xsl:call-template>

          <xsl:call-template name="change">
			<xsl:with-param name="name_string" select="$CustomerSignerLName"/>
    		        <xsl:with-param name="delimiter" select="' '"/>
	 </xsl:call-template>