Well, I'm not sure who "u" is, but instead of waiting for him, I'll explain it.
The flush attribute simply specifies whether the response buffer is flushed prior to including the referenced resource. Prior to JSP 2.0, this attribute must be set to true. With JSP 2.0, it can be set to true or false.
This type of information is readily available in the JSP Specification. If you are writing JSPs and do not have a copy of the specification open on your desktop (virtual or otherwise), you're doing it wrong. [ September 28, 2005: Message edited by: Bear Bibeault ]