[Seaside] how to catch a XmlHttpRequest to evaluate a callback

[Burella Juan M.]

Hello all.
If I´d want to port a javascript library, say SmartClient, YUI, Dojo, etc.
(not Prototype compatible), how would I catch the XmlHttpRequest and
evaluate a block with a canvas as argument and reply to the client what has
been "rendered" inside that block? (I suppose this is what Scriptaculous
does through callbacks but I cannot find where and how).
Cheers

Juan Matías.
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