Passing parameter to stylesheet from servlet

hi,
please help me on this regard !

How do I pass request parameters to stylesheet from a servlet. ?
The problem is that the 2nd argument of the method setStylesheetParam("","")
, takes an expression and string has to be given like "'I am a string '".
Now how do I pass request parameters in this 2nd argument ?

The code i am using is faulty and I want to know how to correct it -

String category_ = request.getParameter("category");
String topic_ = request.getParameter("topic");
String course_ = request.getParameter("course");
String file_ = request.getParameter("file");

XSLTProcessor processor = XSLTProcessorFactory.getProcessor();

XSLTInputSource input=new
XSLTInputSource("file:///c:/jdk/library/insert.xml");
XSLTInputSource style=new
XSLTInputSource("file:///c:/jdk/library/insert.xsl");
XSLTResultTarget output=new XSLTResultTarget("c:/jdk/library/try.xml");

try{ 

processor.setStylesheetParam("category",category_); 
processor.setStylesheetParam("topic","'topic_'"); 
processor.setStylesheetParam("course","'course_'"); 
processor.setStylesheetParam("file","'file_'"); 


THANKS in advance
manjul


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