GetParameter from XSL

I've tried the next javascript code while accessing
from an onClick in an XSLT stylesheet, but
unfortunately I get an error at the "var" definition
when trying to get a parameter value in the stylsheet.
Does anybody know why?

=======================================================
     xslProc_table = xslTemp_table.createProcessor();
     xslProc_table.input = xml_table;

     var sortVal = xslProc_table.getParameter(null,
"sortorder");
     alert(xslProc_table.stylesheet.xml);
     
     if (sortVal == "" || sortVal == "descending")
     	xslProc_table.addParameter("sortorder",
"ascending");
     else
     	xslProc_table.addParameter("sortorder",
"descending");
=======================================================


=====
Regards, Claudio.

IT Consultant.
Buenos Aires, Argentina.
e-mail: claudio_russo@xxxxxxxxx


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