xslt problem with ie5.5

Hi

I could use some help.

I'm trying to rewrite a stylesheet that worked proparly with IE6 to IE5.5.
as it seems some xsl tags are not supported. I would much appriciate if anyone
could send me a sample or a reference so I could see exactly what xsl tags I can use and 
what namespaces.

this is what I use in the stylesheet tag:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
xmlns:user="http://www.w3.org/tr/WD-xsl">

Thanks
Barak