Converting wd-XSL to XSLT

I've recently begun a job that will require me to get the hang of XSL,
so I'm still a bit over my head.

I'm working with an online database which allows clients to get
information from tables in XML, and then create custom views with XSL.
 Before I was brought on, my co-workers, discovered a cache of XSL
stylesheets provided by database, and we've been tweaking those files
to suit our purposes.

The problem is that I've come to learn that all of these stylesheets
are in wd-XSL, which I presume is the reason they won't work in
Mozilla or Firefox.  I'd like to convert them, but I don't know how. 
I've determined that the <xsl:eval> and <xsl:script> tags are
outdated, but I don't know what to replace them with.  I began to give
in to writing all future stylesheets in wd-XSL, but I quickly realized
that a lot of the code I've been learning from my XSLT books isn't
going to be backwards-compatible.  So it's looking like I only know
enough about each version to get nothing done with either of them.

I learned about a program for converting wd-XSL to XSLT, but the
resulting code didn't make a lot of sense.  I'd much rather learn how
to convert from one to the other by hand, so that I can get a feel for
the differences between them.  Can anyone help me?

Jim Smith