Customize user.footer.content for one webpage only?

I've defined the template user.footer.content to append a copyright note  
to every webpage (I use chunking). For the first page (index.html) I'd  
like to customize user.footer.content: The version number and the  
publishing date should be appended, too.

Now I've seen that the template chunk-element-content in chunk.common.xsl  
simpy always calls the template user.footer.content - no matter what  
webpage is written. That's why I guess I need to find out in  
user.footer.content somehow to which file the content is currently  
appended: If it's the beginning of the book (the book's titlepage)  
something more should be appended. Is this possible? I think I need a  
<xsl:if test="..."> but what exactly do I have to test?

Boris