EL expressions with the jsp
aram tag will only work in a JSP2.0 container (eg
Tomcat 5)
Your web.xml also needs to be up to date, otherwise it disables EL.
http://faq.javaranch.com/view?ServletsWebXml If you don't have a JSP2.0 container, it will not work.
However that first one I posted
should work anywhere (I think)
<jsp
aram name="Filename" value="<%= pageContext.findAttribute("Action").toString() + "?action=GET_IMAGE" %>"/>
Good luck,
evnafets