How to access a JAVA Script variable in JSP Code

How to access a JAVA Script variable in JSP Code. I have been unable todo this.
Plz Suggest a way.
Thanks
Soumya

try to do this code
String s=request.getParameter("javascriptvariablename");

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String age=[ here i need to set the value of "scroll" ]
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< ht m lb:page title=" "    >
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How to access a JAVA Script variable in JSP Code

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