I'm interested in doing the ajax event when people mouseover a
tiddler.  Should I then hijack the
"Story.prototype.onTiddlerMouseOver" function?

You might wanna take advantage of jQuery instead:
    jQuery(".tiddler").live("hover", enterHandler, exitHandler);

I'm seeing that everytime I mouse over a tiddler, the timestamp pops
up 6 times

Mouse events can be fickle - it might be worth reading through the jQuery API docs; IIRC, they have some nice explanations of the various event types there:
http://api.jquery.com/category/events/

(jQuery's events are often just normalized versions of native events, componsating for differences between browsers)

does the ajax thing already ignore multiple calls and only answers
when it's ready?

There is no limitation or throttling by default - the browser will fire XHRs as the code states, each request triggering a callback when the response has been received.

if I add a timestamp outside of the function.. how should I add it?
I'm not quite certain how to best designate the variable so it behaves
well with the rest of the DOM.

I'm afraid I don't understand the question. Are you asking about vaiable scope and namespaces?


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