project folder not loadin in the tomcat 5.0

The web.xml i had from tomcat 4 was

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
<display-name>Java Servlet Programming Examples</display-name>
<description>
Java Servlet Programming Examples.
</description>
<servlet>
<servlet-name>
helloWorld
</servlet-name>
<servlet-class>
HelloWorld
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>
helloworld
</servlet-name>
<url-pattern>
/hello.html
</url-pattern>
</servlet-mapping>

</web-app>