Exception while using JNDI resources

I have configured my database connections using JNDI resources of Tomcat5.0 server. Ihave followed all the steps of Tomcat configuration and when i run the application i get the following exception \

javax.naming.NameNotFoundException: Name jdbc is not bound in this Context

my code is as follows

<%@page contentType="text/html" import="java.sql.*,javax.sql.*,java.io.*,javax.naming.*"%>
<%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%
Connection con1=null,con2=null;
Statement st2=null;
ResultSet rs2 = null;
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>DBTest Page</title>
</head>
<body>
<%
try
{
Context initContext = new InitialContext();
DataSource ds = (DataSource)initContext.lookup("jdbc/javatest");
con2 = ds.getConnection();
st2 = con2.createStatement();
rs2 = st2.executeQuery("SELECT * from tabusers"); %>
<table>
<caption><%= con2.toString() %></caption>
<tr><th>User</th><th>Password</th></tr>
</table>
<div style="overflow:auto; width: 615px; height:180px;">
<table>
<% while(rs2.next())
{%>
<tr><td><%=rs2.getString(3)%></td>
<td><%=rs2.getString(4)%></td></tr>
<%}
%>
</table>
</div>
<%
}
catch(NamingException ne)
{
%> <%= ne %>
<% }

catch(SQLException se)
{
%> <%= se %>
<% }
finally {
// Always make sure result sets and statements are closed,
// and the connection is returned to the pool
if (rs2 != null) {
try { rs2.close(); } catch (SQLException e) { ; }
rs2 = null;
}
if (st2 != null) {
try { st2.close(); } catch (SQLException e) { ; }
st2 = null;
}
if (con2 != null) {
try { con2.close(); } catch (SQLException e) { ; }
con2 = null;
}
}

%>

</body>
</html>

the same code is working fine with Sun Application Server