Replacing recto titlepage

Hi all,

I'm a beginner, I've added a image as my first page of the fo output, but i can't delete the recto title page which was auto generated by the titlepage.templates.xsl.  

As far as i know, the docbook1.78.1 will generate two consecutive titlepages, one shows the title in recto and the subtitle and copyright shows in verso. 

Refer to http://www.sagehill.net/docbookxsl/ReplaceTemplate.html

I've been trying to replace the titlepage.templates.xsl by call-template in my frontcover.xsl, but i failed.

Here is the codes in my frontcover.xsl, and part of it are definitely wrong:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
<xsl:import href=""> 

  	<xsl:template name="front.cover">
	<xsl:call-template name="page.sequence">

		<xsl:with-param name="master-reference">front-cover</xsl:with-param>
		<xsl:with-param name="content">

 			<fo:block alignment-adjust="auto">
				<fo:external-graphic src="" content-width="{$page.width}" content-height="{$page.height}" display-align="center"/>

			</fo:block>
		</xsl:with-param>
	</xsl:call-template>

	</xsl:template>
	
	<xsl:template name="user.pagemasters">

		<fo:simple-page-master master-name="front-cover" page-width="{$page.width}" page-height="{$page.height}" margin-top="0pt" margin-bottom="0pt" margin-left="0pt" margin-right="0pt">

 		<fo:region-body margin-top="0pt" margin-bottom="0pt" margin-left="-0pt" margin-right="0pt"/> 
		</fo:simple-page-master>

	</xsl:template> 

       <xsl:template name="book.titlepage.recto">
	       <xsl:call-template name="user.pagemasters"/> 

       </xsl:template>
</xsl:stylesheet>

And all  i want is to delete the recto page and keep the verso one - replace the recto page by the image cover.

Can anyone give me some advice?

Thanks in advance.

Mona Qi