[xsl] Default namespace problem

It is driving me nuts:


XSLT:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:bt="http://www.csgsystems.com/bta" exclude-result-prefixes="bt">


XML:
<OrderRequest xmlns:bt="http://www.csgsystems.com/bta">



Works fine!!

But if XML has a default namespace instead:

XML:
<OrderRequest xmlns="http://www.csgsystems.com/bta">


How do I do that in XSLT?

Please help me; they have jailed me into the office. ;o)

Houman