Ocfs devel - Feb 2009 - how to change character set to unicode in 10g over sql server 2003

Just now we have started development and our client want database character
set is in unicode.what we have is given below please suggest ASAP...
> select * from nls_database_parameters where parameter like
'%CHARACTERSET';
PARAMETER VALUE
NLS_CHARACTERSET WE8MSWIN1252
NLS_NCHAR_CHARACTERSET AL16UTF16
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