use
context file. like this :
<Context docBase="D:\MYAPP" path="/myapp" debug="99" reloadable="true">
</Context>
create a xml with above tag. Attribute docBase refers to app root and path refers your app context. Name this xml file like "myapp.xml" (its not hard and fast rule...but its a convention). Place it in tomcat\conf\Catalina\localhost
start the server.......
This will help you
-- sree