Error while compiling Servlet

Hello everyone,
I am quite new to the Java Technology.
I have this simple servlet program which gives me an error when I try to compile it.
The error is as follows:
TestServlet.java:1: package javax.servlet does not exist
import javax.servlet.*;
^
TestServlet.java:2: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
Is this anything to do with the classpath or path settings?
Any help would be highly appreciated.
Thanks in advance,

I have this file called servlet.jar which has some
.class files.And this file is in the classpath.Just open it with WInZip or some ZIP viewing utility and check if the required classes are present.

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