Yes,
you should probably be using Tomcat 5, if you read the section entitled
The JavaServer Pages 2.0 Specification
from this article about Tomcat 5
http://www.onjava.com/pub/a/onjava/2004/01/28/tomcat5.html You will see it says
"This new version of
JSP is quite a bit larger due to its many new features, but aims to be backward-compatible with JSP 1.2. The most important addition to JSP 2.0 is the inclusion of the JavaServer Pages Expression Language (EL)."