to explain my previous comment, if you do
$(document).ready(function() {
> $('#foo').click(function() {
> $(this).css("backgroundColor", "blue");
> });
> });
>
and you change the node holding the "foo" element, since you attached the
click event on document ready, the event will not work again after the
change, so with the live event you make the browser keep looking for "foo"
element like the observe event from prototype, so if you update somehow the
"foo" element the click event will be reattached
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